scholarly journals Effect of Melt Overheating on Structure and Mechanical Properties of Al-Mg-Si Cast Alloy

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1353
Author(s):  
Vladislav Deev ◽  
Evgeny Prusov ◽  
Ernst Ri ◽  
Olga Prihodko ◽  
Svetlana Smetanyuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Crystallization Process ◽  
Cast Alloy ◽  
Degree Of Saturation ◽  
Structural Components ◽  
Pouring Temperature ◽  
Aluminum Solid Solution ◽  
Fast Cooling ◽  
Average Size

The paper discusses the complex effect of melt overheating with subsequent fast cooling down to the pouring temperature on the crystallization process, microstructure and mechanical properties of Al-Mg-Si aluminum alloy. The results obtained facilitated the establishment of rational modes of melt overheating, leading to a significant change in the dispersion and morphology of structural components. In particular, with an increase in the melt overheating temperature to 900 °C with holding and subsequent rapid cooling to the casting temperature, a decrease in the average size of dendritic cells of the aluminum solid solution from 39 μm to 13 μm was observed. We also noticed the refinement of eutectic inclusions of the Mg2Si phase with compact morphology. An increased level of mechanical properties was noted; the maximum values of tensile strength and elongation reached 228 MPa and 5.24%, respectively, which exceeded the initial values by 22.5% and 52.3%, correspondingly. The microhardness of the aluminum solid solution sequentially increased from 38.21 to 56.5 HV with an increase in the temperature during melt overheating. According to the EDS linear scanning, an increase in the superheat temperature of the melt is accompanied by an increase in the degree of saturation of the solid solution with magnesium.

Influence of Sr Addition on Microstructure and Mechanical Properties of Ignition-Proof AZ91D-0.3Be Magnesium Alloy

2011 ◽  
Vol 335-336 ◽  
pp. 783-786
Author(s):  
Fu Yin Han ◽  
Lin Hai Tian ◽  
Hong Xia Wang ◽  
Wei Liang ◽  
Wen Xian Wang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Cast Alloy ◽  
Solid Solution Alloy ◽  
Aged Alloy ◽  
Microstructure And Mechanical Properties ◽  
Solid Liquid Interface ◽  
Solid Liquid

Sr added ignition-proof AZ91D-0.3Be magnesium alloy was prepared. The influence of Sr content on microstructure and mechanical properties of the alloy was studied. Results show that the microstructure of ignition-proof AZ91D-0.3Be magnesium alloy is refined by a small amount of Sr addition. It is due to that the enrichment of a few Sr atoms in solid liquid interface in the process of magnesium alloy solidification inhibits grain growth and accelerates more nucleation. However, with increasing of Sr addition the microstructure is coarsened. By 0.01% Sr addition the tensile strength of as-cast experimental alloy is increased by about 25% and that of both the solid-solution and aged alloy is increased by about 40%. The elongation of as-cast alloy is increased by about 20% and that of solid-solution alloy increased by about 30%.

Microstructural and Vickers Microhardness Evolution of Heat Treated Secondary Aluminium Cast Alloy

2013 ◽  
Vol 586 ◽  
pp. 137-140 ◽  
Author(s):  
Lenka Hurtalová ◽  
Eva Tillová ◽  
Mária Chalupová
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Artificial Aging ◽  
Vickers Microhardness ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Holding Time ◽  
Age Hardening ◽  
Structural Components ◽  
Heat Treated

Secondary aluminium alloys are made out of aluminium scrap and aluminium-processable waste by recycling. These alloys contain different alloying elements such as Al, Cu, Fe, Si and Mg that form intermetallic phases in aluminium matrix and influence on the microstructure, basic mechanical properties and microhardness evolution in aluminium cast alloy. As experimental material was used secondary aluminium cast alloy AlSi9Cu3. Material was subjected to heat treatment (age-hardening) consisting of a solution treatment at temperature 515 °C with holding time 4 hours, than water quenching at 40 °C and artificial aging by different temperature 130 °C, 150 °C and 170 °C with different holding time (2, 4, 8, 16 and 32 hours). The age-hardening led to changes in the morphology of structural components, but also leads to precipitation of finer hardening phases in the material substructure. As optimal age-hardening mode for secondary aluminium cast alloy AlSi9Cu3 was determined mode consisting of solution treatment at temperature 515 °C with holding time 4 hours and artificial aging at temperature 170 °C with holding time 16 hours. After this heat treatment cast alloy shows the best changes in microstructure and mechanical properties. These changes are comparable with changes by primary AlSi9Cu3 cast alloy.

scholarly journals Improvement of Vanadium Alloys by Precipitate Control for Structural Components of Fusion Reactors

2005 ◽  
Vol 475-479 ◽  
pp. 1449-1454 ◽  
Author(s):  
Takeo Muroga ◽  
Takuya Nagasaka ◽  
A. Nishimura ◽  
J.M. Chen
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Solution Heat Treatment ◽  
Cold Working ◽  
Fusion Reactors ◽  
High Temperature Strength ◽  
Structural Components ◽  
Vanadium Alloys ◽  
Fusion Structural Materials

Potential enhancement of mechanical properties of V-4Cr-4Ti by controlling precipitates of interstitial impurities (C, O and N) was investigated by means of various thermal and mechanical treatments. The increase in the cold working degree resulted in band structure of coarse Ti-CON precipitates having enhanced impact properties. Solid solution heat treatment followed by re-heating resulted in the formation of high density Ti-O-C precipitates enhancing high temperature strength. Combination of re-heating and cold rolling enhanced further the strength. Improvements in thermal and mechanical treatments are discussed for application of V-4Cr-4Ti to fusion structural materials.

scholarly journals Development of Hot-Extruded Mg–RE–Zn Alloy Bar with High Mechanical Properties

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1722 ◽  
Author(s):  
Zehua Li ◽  
Jinghuai Zhang ◽  
Yan Feng ◽  
Jinshu Xie ◽  
Yinfu Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Elevated Temperature ◽  
Basal Plane ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Hot Extrusion ◽  
Tensile Yield Strength ◽  
Elevated Temperature Strength ◽  
Solid Solution Treatment

A new elevated-temperature high-strength Mg–4Er–2Y–3Zn–0.4Mn (wt %) alloy was developed by semi-continuous casting, solid solution treatment, and hot extrusion. W phase (Mg3(Er,Y)2Zn3) with fcc structure, long period stacking ordered phases with 18R (Mg10(Er,Y)1Zn1) and 14H (Mg12(Er,Y)1Zn1) structures, and basal plane stacking faults (SFs) was formed in the as-cast alloy, mainly due to the alloy component of (Er + Y)/Zn = 1:1 and Er/Y = 1:1 (at %). After solid solution treatment and hot extrusion, the novel microstructure feature formed in as-extruded alloy is the high number-density nanospaced basal plane SFs throughout all the dynamically recrystallized (DRXed) and un-DRXed grains, which has not been previously reported. The as-extruded alloy exhibits superior tensile properties from room temperature to 300 °C. The tensile yield strength can be maintained above 250 MPa at 300 °C. The excellent elevated-temperature strength is mainly ascribed to the formation of nanospaced basal plane SFs throughout the whole Mg matrix, fine DRXed grains ~2 μm in size, and strongly basal-textured un-DRXed grains with profuse substructures. The results provide new opportunities for the development of deformed Mg alloys with satisfactory mechanical properties for high-temperature services.

scholarly journals Investigation of the Effect of Heat Treatment on the Microstructures and Mechanical Properties of Al-13Si-5Cu-2Ni Alloy

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 688
Author(s):  
Zhi-Fa Wang ◽  
Tian-Jing Miao ◽  
Shu-Qing Kou ◽  
Shuang Zhang ◽  
Feng Qiu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Cast Alloy ◽  
Eutectic Silicon ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Solution Treatment Temperature ◽  
Solid Solution Treatment ◽  
Microstructures And Mechanical Properties

An experimental investigation was carried out to study the effects of solid solution treatment and aging treatment on the microstructures and mechanical properties of an Al-13Si-5Cu-2Ni alloy. The results show that the size of eutectic silicon decreased with solid solution treatment temperature increasing until 510 °C. Subsequently, the eutectic silicon size continued to increase as the temperature increased to 520 °C. Initially, the acicular eutectic silicon of the as-cast alloy was 10.1 μm in size. After the solid solution treatment at 510 °C, the eutectic silicon size was reduced to 6.5 μm. The θ′ phase is the main strengthening phase in the alloy, therefore, the effect of aging treatment on θ′ phases was explored. As the aging time increased, the diameter, length, and fraction volume of the θ′ phases were found to increase. The main reason for the improved performance of this alloy following heat treatment is the passivation spheroidization of the silicon phase and Orowan strengthening due to the θ′ phases. The optimal tensile strength of an Al-13Si-5Cu-2Ni alloy was obtained after solid solution treatment at 510 °C for 8 h followed by an aging treatment at 165 °C for 8 h. Therefore, this work has great significance for promoting the application of Al alloys at high temperatures.

The Effect of Homogenization on the Annealing of Al-1,5%Mn Aluminium Alloy

2013 ◽  
Vol 752 ◽  
pp. 193-197 ◽  
Author(s):  
Tibor Hegyes ◽  
Peter Barkoczy
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Crystallization Process ◽  
Cast Alloy ◽  
Solid Solution Phase ◽  
Degree Of Deformation ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
Pre Treatment ◽  
Temperature Heat Treatment

The softening of Al-Mn base alloys not only depend on the degree of deformation and the parameters of annealing, but the pre-treatment of as-cast alloy. Large extent of the Mn remains in the solid solution during the crystallization process. During a high temperature heat treatment the manganese precipitate from the solid solution phase. The size and amount of the precipitations mainly of the processes takes place during annealing. In this article this effect is studied through the heat treatment and deformation of a specific alloy.

Microstructures and Mechanical Properties of Mg-10Gd-3Y-2Zn-0.5Zr Alloy

2014 ◽  
Vol 788 ◽  
pp. 122-126
Author(s):  
Yong Dong Xu ◽  
Jun Wang ◽  
Zhi Wen Shao ◽  
Rong Wang ◽  
Xiu Rong Zhu
Keyword(s):  
Mechanical Properties ◽  
Lamellar Structure ◽  
Cast Alloy ◽  
Hot Extrusion ◽  
Tensile Yield Strength ◽  
Long Period ◽  
Stacking Order ◽  
Peak Aged ◽  
Microstructures And Mechanical Properties ◽  
Average Size

Microstructures and mechanical properties of Mg-10Gd-3Y-2Zn-0.5Zr alloy were investigated. Three kinds of phases including Mg, Mg3(GdYZn) and Mg12(GdY)Zn were found in the as-cast alloy. Two different patterns of the long-period stacking order (LPSO) phases including lamellar structure and block-like structure were observed in the homogenized alloy and both of them were identified as the phase of Mg12(GdY)Zn. After extrusion with ratio of 10:1 under 420°C, fine dynamic recrystallized grains were obtained and its average size was only about 4μm. The alloy exhibited excellent mechanical properties by hot extrusion and heat treatment. The ultimate tensile strengths of the as-extruded and peak-aged alloys were 415MPa and 480MPa, the tensile yield strength were 335MPa and 410MPa, the elongations were 16% and 13.5%, respectively. The high mechanical properties were mainly attributed to the combined effects of fine grains, LPSO phases and the dispersed precipitates.

scholarly journals Influence of Solution Heat Treatment on Structure and Mechanical Properties of ZnAl22Cu3 Alloy

2016 ◽  
Vol 61 (3) ◽  
pp. 1581-1586 ◽  
Author(s):  
R. Michalik ◽  
B. Chmiela
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solid Solution ◽  
Solution Heat Treatment ◽  
Supersaturated Solid Solution ◽  
Cast Alloy ◽  
Dendritic Structure ◽  
Alloy Hardness ◽  
Ε Phase ◽  
Phase Solution

Abstract The influence of solution heat treatment at 385°C over 10 h with cooling in water on the structure, hardness and strength of the ZnAl22Cu3 eutectoid alloy is presented in the paper. The eutectoid ZnAl22Cu3 alloy is characterized by a dendritic structure. Dendrites are composed of a supersaturated solid solution of Al in Zn. In the interdendritic spaces a eutectoid mixture is present, with an absence of the ε (CuZn4) phase. Solution heat treatment of the ZnAl22Cu3 alloy causes the occurrence of precipitates rich in Zn and Cu, possibly ε phase. Solution heat treatment at 385°C initially causes a significant decrease of the alloy hardness, although longer solution heat treatment causes a significant increase of the hardness as compared to the as-cast alloy.

Severe plastic deformation of Al-1%Cu Alloy processed by a Simple Cyclic Extrusion Compression technique

2018 ◽  
Vol 1 (1) ◽  
pp. 77-90
Author(s):  
Walaa Abdelaziem ◽  
Atef Hamada ◽  
Mohsen A. Hassan
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Deformation Behavior ◽  
Cast Alloy ◽  
Surface Hardness ◽  
Grain Structure ◽  
Compression Technique ◽  
Cu Alloy ◽  
Cyclic Extrusion Compression

Severe plastic deformation is an effective method for improving the mechanical properties of metallic alloys through promoting the grain structure. In the present work, simple cyclic extrusion compression technique (SCEC) has been developed for producing a fine structure of cast Al-1 wt. % Cu alloy and consequently enhancing the mechanical properties of the studied alloy. It was found that the grain structure was significantly reduced from 1500 µm to 100 µm after two passes of cyclic extrusion. The ultimate tensile strength and elongation to failure of the as-cast alloy were 110 MPa and 12 %, respectively. However, the corresponding mechanical properties of the two pass CEC deformed alloy are 275 MPa and 35%, respectively. These findings ensure that a significant improvement in the grain structure has been achieved. Also, cyclic extrusion deformation increased the surface hardness of the alloy by 49 % after two passes. FE-simulation model was adopted to simulate the deformation behavior of the material during the cyclic extrusion process using DEFORMTM-3D Ver11.0. The FE-results revealed that SCEC technique was able to impose severe plastic strains with the number of passes. The model was able to predict the damage, punch load, back pressure, and deformation behavior.

CARLSON ALLOY C600 and C600 ESR

Alloy Digest ◽  
1994 ◽  
Vol 43 (11) ◽  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Fracture Toughness ◽  
Cold Working ◽  
Elevated Temperatures ◽  
High Strength ◽  
Heat Treating ◽  
Solid Solution Alloy ◽  
Resistance To Oxidation ◽  
Good Workability

Abstract CARLSON ALLOYS C600 AND C600 ESR have excellent mechanical properties from sub-zero to elevated temperatures with excellent resistance to oxidation at high temperatures. It is a solid-solution alloy that can be hardened only by cold working. High strength at temperature is combined with good workability. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: Ni-470. Producer or source: G.O. Carlson Inc.

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