scholarly journals Effects of solution and aging treatment parameters on the microstructure evolution of Ti–10V–2Fe–3Al alloy

2020 ◽  
Vol 39 (1) ◽  
pp. 501-509
Author(s):  
Wan-Liang Zhang ◽  
Wen-Tao Hao ◽  
Wei Xiong ◽  
Guo-Zheng Quan ◽  
Jiang Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aging Temperature ◽  
Treatment Process ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Solution Temperature ◽  
Air Cooling ◽  
Water Cooling ◽  
Β Phase ◽  
Aging Conditions

AbstractThe solution-aging treatment parameters, including solution temperature, cooling rate and aging temperature, have significant influences on the microstructures and comprehensive mechanical properties of titanium alloy. In this work, the detailed microevolution behaviors of Ti–10V–2Fe–3Al alloy under different solution and aging conditions have been investigated through a series of heat-treatment experiments. The results of solution-treatment experiments reveal that the content of αp-phase is reduced to zero as the solution temperature is raised to a certain α → β critical transformation point. Recrystallized β-grains can be observed at the solution temperature of 820°C. In addition, the cooling way (air cooling or water cooling) has little influence on the microevolution behaviors for this alloy during the solution-treatment process. As for the solution-aging-treatment experiments, the results reveal that αs-phases are precipitated from the supersaturated β-phase, and the fraction of αs-phase increases with increasing aging temperature. However, the precipitated α-grains intend to coalesce and coarsen as the aging temperature raises above 510°C. Therefore, the advocated solution-aging-treatment program is solution treatment at 820°C with air cooling followed by aging treatment at 510°C with air cooling.

Enhancement of Mechanical Properties of Cast Beta-Type Titanium Alloy by Aging Treatment

2018 ◽  
Vol 929 ◽  
pp. 42-49
Author(s):  
Zuldesmi Mansjur ◽  
Hendro Maxwel Sumual
Keyword(s):  
Mechanical Properties ◽  
Aging Time ◽  
Vickers Hardness ◽  
Aging Temperature ◽  
Dendritic Structure ◽  
Solution Treatment ◽  
Aging Treatment ◽  
High Oxygen Content ◽  
Precision Casting ◽  
Β Phase

Beta type Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) is one of the titanium alloys which have gained much attention in dental applications. Dental precision casting is predominant for fabricating dental prostheses. However, there is a possibility for the mechanical properties of its casting to be degraded because of a α case, shrinkages and pores and a dendrite structure. One of the ways to enhance their mechanical properties is heat treatment process. Therefore, the aim of this study is to investigate the effect of aging treatment on mechanical properties and microstructure of TNTZ cast into magnesia based mold in order to improve its mechanical properties. As results, the Vickers hardness of the cast TNTZ after solution treatment is larger than that of the wrought TNTZ. The aging curve of the cast and the wrought TNTZ at an aging temperature of 673 K and 723 K exhibit almost similar pattern. For each aging time, the higher the aging temperature, the smaller the Vickers hardness for both alloys. Microstructures of cast TNTZ at various aging conditions consist of a dendritic structure and the average diameters of their grain size are around 40 μm. The diffraction peaks of precipitation of α and β phase s are detected in under aging (UA), peak aging (PA) and over aging (OA) conditions for both aging temperatures. However, the diffraction peak of ω phase is observed only in OA condition for cast TNTZ at aging temperature of 673 K. The highest tensile strength of the cast TNTZ and the wrought TNTZ at both aging temperatures are in PA condition and the elongation decrease continuously by increasing aging time. The tensile strengths of cast TNTZ in UA, PA and OA conditions at an aging temperature of 723 K are lower and their elongations are higher in comparison with those of 673 K. The high oxygen content seems to contribute to the poor elongation. SEM fractographs of the cast TNTZ at aging temperatures of 673 and 723 K in UA, PA and OA conditions show the brittle morphology with intergranular fracture that increases with increasing of aging time.

scholarly journals Microstructure Evolution and Mechanical Properties of AZ80 Mg Alloy during Annular Channel Angular Extrusion Process and Heat Treatment

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4223 ◽  
Author(s):  
Xi Zhao ◽  
Shuchang Li ◽  
Fafa Yan ◽  
Zhimin Zhang ◽  
Yaojin Wu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Microstructure Evolution ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Annular Channel ◽  
Mg Alloy ◽  
Strengthening Effect ◽  
Β Phase ◽  
Angular Extrusion

Microstructure evolution and mechanical properties of AZ80 Mg alloy during annular channel angular extrusion (350 °C) and heat treatment with varying parameters were investigated, respectively. The results showed that dynamic recrystallization of Mg grains was developed and the dendritic eutectic β-Mg17Al12 phases formed during the solidification were broken into small β-phase particles after hot extrusion. Moreover, a weak texture with two dominant peaks formed owing to the significant grain refinement and the enhanced activation of pyramidal <c + a> slip at relative high temperature. The tension tests showed that both the yield strength and ultimate tensile strength of the extruded alloy were dramatically improved owing to the joint strengthening effect of fine grain and β-phase particles as compared with the homogenized sample. The solution treatment achieved the good plasticity of the alloy resulting from the dissolution of β-phases and the development of more equiaxed grains, while the direct-aging process led to poor alloy elongation as a result of residual eutectic β-phases. After solution and aging treatment, simultaneous bonding strength and plasticity of the alloy were achieved, as a consequence of dissolution of coarse eutectic β-phases and heterogeneous precipitation of a large quantity of newly formed β-phases with both the morphologies of continuous and discontinuous precipitates.

Effects of Heat Treatment on Microstructures and Mechanical Properties of Ti-38644 Alloy for Aerospace Fasteners

2018 ◽  
Vol 913 ◽  
pp. 109-117 ◽  
Author(s):  
Qing Yun Zhao ◽  
Si Rui Cheng ◽  
Li Dong Wang ◽  
Li Min Dong ◽  
Feng Lei Liu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Tensile Strength ◽  
Solution Temperature ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Air Cooling ◽  
Β Phase ◽  
Α Phase

The effects of heat treatment on microstructure and mechanical properties of Ti-38644 alloy were investigated by scanning electron microscope (SEM) and transmission electron microscopy (TEM) as well as uniaxial tensile test. The results show that when the solution temperature is lower than 845°C, the microstructure of Ti-38644 alloy is equiaxed β phase with the grain size of 20μm, and the tensile strength is about 960MPa. As raising solution temperature to 860°C, the grain size of Ti-38644 alloy increases to 100μm and the tensile strength decreased to 870MPa. There are a large number of secondary α phase precipitated from the grain boundaries and within grain of β phase undergoing aging treatment. Secondary α phase coarsens with increasing the aging temperature, leading to the decrease of tensile strength. After solution treatment at 815°C for 1.5h, water quenching plus aging at 520°C for 10h, air cooling, Ti-38644 alloy shows a better mechanical property with the tensile strength 1330MPa, elongation and reduction of area 10% and 45% respectively.

Microstructures and Mechanical Properties of an Al-Cu-Li-Mg-Zr Alloy Containing Zn and Mn

2007 ◽  
Vol 546-549 ◽  
pp. 995-1002 ◽  
Author(s):  
Yong Lai Chen ◽  
Jin Feng Li ◽  
Yu Wei Zhang ◽  
Zi Qiao Zheng
Keyword(s):  
Mechanical Properties ◽  
Aging Temperature ◽  
Solution Treatment ◽  
Heat Treatments ◽  
Alloying Elements ◽  
Solution Temperature ◽  
Lower Strength ◽  
Microstructures And Mechanical Properties ◽  
Zr Alloy

An Al-3.43Cu-1.28Li-0.49Mg-0.12Zr containing 0.62Zn and 0.29Mn was designed and the microstructures and mechanical properties of the alloy with various heat treatments were investigated. The precipitates of the alloy consist of T1 (Al2CuLi), θ′ (Al2Cu) σ (Al5Cu6Mg2) and δ′ (Al3Li). As solution temperature is changed from 485°C to 530°C, the solution degree of alloying elements in alloy increased, the amount of T1 in the alloy aged at 160°C for 18 h increased and that of θ′ is decreased, resulting in an increase of strength. After solution treatment at 530°C, the alloy aged for 18 h at 145°C is mainly strengthened by G P zones, and a little amount of T1 precipitates. As aging temperature is increased to 160°C and 175°C, the strength increased, due to the sufficient precipitation of σ and T1. The smaller amount of T1 in the alloy aged at 190°C is consistent with its lower strength. Meanwhile, it is found that the σ precipitate does not coarsen as aging temperature increases in the range from 160°C to 190°C.

Effects of Solid Solution Temperature on the Structure and Properties of TC16 Titanium Alloy Bars

2014 ◽  
Vol 881-883 ◽  
pp. 1588-1591
Author(s):  
Quan Ming Liu ◽  
Zhao Hui Zhang ◽  
Hai Ying Yang ◽  
Shi Feng Liu
Keyword(s):  
Solid Solution ◽  
Titanium Alloy ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Martensite Phase ◽  
Solution Temperature ◽  
Β Phase ◽  
Solid Solution Treatment ◽  
Structures And Properties ◽  
Reduction Of Area

The effects of solid solution temperature on the structures and properties of TC16 titanium alloy bars that made solid solution treatment in 780°C, 800°C, 850°C, 900°C, respectively, the processing time for 30min, then cooled in the air were studied. The results show that during solid solution treatment under 800°C, the alloy structures are the primary ɑ phase and the metastable β phase, while solid solution temperature rise to 800°C, the alloy structures begin to appear ɑ" martensite phase. With the increase of solid solution temperature, the alloy grain grow up somewhat, material tensile strength increases gradually, yield strength firstly decreases and then increases, elongation at break firstly increases and then decreases, percentage reduction of area at break decreases gradually. Solid solution state of TC16 titanium alloy bars are not suitable for cold heading forming, strengthening the titanium alloy must be subsequent artificial aging treatment.

Microstructure and Mechanical Properties of Al-12.7Si-0.7Mg Alloy Welded Joints Using Homogeneous Welding Wire

2013 ◽  
Vol 712-715 ◽  
pp. 647-650
Author(s):  
Hao Wang ◽  
Chang Shu He ◽  
Hong Jun Zhang ◽  
Dong Wang ◽  
Xiang Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Welded Joints ◽  
Artificial Aging ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Solution Temperature ◽  
Welding Wire ◽  
Microstructure And Mechanical Properties ◽  
Treatment Conditions

A novel Al-12.7Si-0.7Mg welding wire was successfully produced via DC casting, extrusion, roll die drawing and hole die drawing. An investigation was performed on the microstructure and mechanical properties of the welded joints using the as-produced special filler wire in different solid solution and artificial aging treatment conditions. The results showed that the as-produced Al-12.7Si-0.7Mg welding wire was an ideal special wire of the Al-12.7Si-0.7Mg wrought alloy and the homogeneous welded joints proved to be heat-treatable. Solid solution treatment and artificial aging treatment had significant influence on the microstructure, microhardness and tensile properties of the as-welded joints. A transformation of microstructures from a coarse structure to a fine structure occurred in the welded joints after the heat treatment. The microhardness and the strength of the joints increased remarkably as the solution temperature and aging time increased.

Effect of Heat Treatment on Microstructure and Corrosion Behavior of Az91d Magnesium Alloy

2013 ◽  
Vol 685 ◽  
pp. 102-106 ◽  
Author(s):  
Lih.T Chye ◽  
M.Z.M. Zamzuri ◽  
S. Norbahiyah ◽  
Khairul Azwan Ismail ◽  
M.N.B. Derman ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Corrosion Behaviour ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Accelerated Corrosion ◽  
Β Phase ◽  
Cathode Area ◽  
Immersion Testing ◽  
Cast Condition

An AZ91D ingot in the as-cast condition was homogenized by heat treatment process. Then, the microstructures produced and corrosion behaviour after heat treatment was studied in detail. As-cast AZ91D was recrystallize by solution treatment at 415°C and then aged at 175°C for various period of time. The corrosion resistance of all the different microstructures was studied in NaCl solution through weight loss measurement in immersion testing. The β phase was found to have a significant influence on the corrosion behaviour. In solution treatment, β phase dissolution decreased the cathode area leading to accelerated corrosion rate. After aging treatment, fine β phase precipitates between grain and microstructure recrystallize causing an increase in the corrosion resistances.

Effects of Solid-Solution Treatment on Microstructure and Mechanical Properties of HIP Treated Alloy 718

2011 ◽  
Vol 117-119 ◽  
pp. 1315-1318 ◽  
Author(s):  
Shih Hsien Chang ◽  
Shih Chin Lee ◽  
Kuo Tsung Huang ◽  
Cheng Liang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Strength ◽  
Thin Sheet ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Solution Temperature ◽  
Alloy 718 ◽  
Solid Solution Treatment ◽  
Treatment Parameter

The aim of this study is to explore alloy 718 that treated at an optimal HIP process, and then imposed various solid-solution temperatures and aging treatment. The experimental results indicated that Laves and δ precipitations obviously appeared within the grain boundary, under HIP treatment and lower solid-solution temperatures (940°C), which would result in poor mechanical properties. However, Laves and δ phase can be completely dissolved at 1020°C 1 hour solid-solution treatment. The tensile strength was increased to 1331.5 MPa, and elongation reached up to 6.1% under a 1020°C solid-solution and aging treatment. Increasing the solid-solution temperature to 1060°C would cause parts of the NbC to dissolve, thus a large number of the thin sheet-shaped NbC would appear in the solid-solution and aging specimen. The yield stress is slight increase, but a lot of NbC precipitations will result in the decreasing tensile strength (1298.8 MPa) and elongation (5.4%). As a result, the optimal solid-solution treatment parameter of alloy 718 is 1020°C for 1-hour.

HRTEM Analysis of Aging Electrolytic Low-Ti Al Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 1015-1020
Author(s):  
Wen Yan Wang ◽  
Jing Pei Xie ◽  
Wei Li ◽  
Zhong Xia Liu
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Electron Microscope ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Tensile Fracture ◽  
Al Alloy ◽  
Mg2si Phase ◽  
Β Phase ◽  
Precipitated Phases

Electronic tensile testing, scanning electron microscope, transmission electron microscope, X-ray diffractometer and high resolution transmission microscope were employed to investigate the mechanical properties, microstructure, tensile fracture and morphology of the precipitated phases of an electrolytic low-titanium wrought 6009 aluminum alloy. Results showed that the mechanical properties of the electrolytic aluminum sheet were improved by solid solution treatment incorporating with pre-aging treatment. The tensile strength and extensibility were enhanced by a factor of 23% and 38% by pre-aging treatment at 150 °C for 5 minutes respectively; a large quantity of nucleation sites of β˝ phase were generated by pre-aging treatment, which was propitious to the transformation from solid solution state to GP zone, and the stable size of GP zone formed during the pre-aging process promoted the precipitation of Mg2Si phase. The Mg2Si phase was revealed by HRTEM and the crystalline stripes were obtained by Fourier transformation.

Effect of Heat Treatment on the Microstructure and Dynamic Behavior of Ti-10V-2Fe-3Al Alloy

2018 ◽  
Vol 910 ◽  
pp. 155-160 ◽  
Author(s):  
An Jin Liu ◽  
Lin Wang ◽  
Hua Xiang Dai
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Titanium Alloy ◽  
Yield Strength ◽  
Dynamic Compression ◽  
Aging Treatment ◽  
Solution Temperature ◽  
Β Phase ◽  
Solution Treated ◽  
Α Phase

Microstructure evolution and compression property of Ti-10V-2Fe-3Al titanium alloy were studied in this paper. Solution treatments were performed at temperature ranging from 710°C to 830°C and some followed by aging treatment. Ti-10V-2Fe-3Al alloys with α+β phase show higher mechanical properties compared with single β phase alloy. With the increase of solution temperature, the content of equiaxed α phase decrease. Consequently, the strength of the alloy increases while the plasticity drops down. The highest yield strength value of 1668 MPa was obtained in the sample treated by 770°C solution treated for 2 hours then water quenched and followed by 520°C aging for 8 hours then air cooled. The stress induced martensite α'' phase appeared after SHPB dynamic compression in the sample solution treated at 830°C.

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