scholarly journals Effects of T5 Treatment on Microstructure and Mechanical Properties at Elevated Temperature of AZ80-Ag Alloy

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3214 ◽  
Author(s):  
Zeng ◽  
Liu ◽  
Gao ◽  
Jiang ◽  
Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperature ◽  
Elevated Temperatures ◽  
Volume Fraction ◽  
Primary Creep ◽  
Dislocation Creep ◽  
Precipitation Process ◽  
Creep Stage ◽  
Microstructure And Mechanical Properties

Effects of T5 treatment on microstructure and mechanical properties at elevated temperature of hot-ring-rolled (HRRed) AZ80-Ag magnesium alloy were systematically investigated. Results show that, after aging at 175 °C for 36 h, discontinuous and continuous precipitates form inside grains, with the former one taking up a volume fraction of ~64.9%. T5 treatment improves the tensile strength at ambient temperature of the alloy but weakens its tensile strength and creep resistance at elevated temperatures (120–175 °C), indicating opposite effects of T5 on mechanical properties at ambient and elevated temperatures. During creep at 120–175 °C and under 70–90 MPa, the dynamic precipitation process in HRRed specimen is accelerated with increasing temperature. At 150–175 °C massive nucleation and growth of dynamic discontinuous precipitates could result in an atypical primary creep stage, consisting of deceleration and acceleration creep stages, which is reported in wrought Mg-Al-based alloy for the first time. Such primary creep stage can be eliminated by T5 treatment. Besides, diffusion-controlled dislocation creep is the dominant creep mechanism for both HRRed and T5 specimens.

Effects of Gd on the Microstructure and Mechanical Properties of Mg-3Sn Alloys

2013 ◽  
Vol 747-748 ◽  
pp. 245-250 ◽  
Author(s):  
Jun Luo ◽  
Rong Shi Chen ◽  
En Hou Han
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Volume Fraction ◽  
Microstructure And Mechanical Properties ◽  
Elongation To Failure ◽  
New Phase

The microstructure and mechanical properties of as-cast Mg-3Sn-xGd (x=0, 0.2, 1 wt.%) alloys were studied by using OM, SEM, EDX, XRD etc. With the increase of Gd, the formation of Mg2Sn phase was impeded and the MgSnGd phase formed and the volume fraction of this new phase obviously increased. The ultimate tensile strength and elongation to failure increased with dilute Gd addition but sharply decreased when the Gd addition comes to 1.34 wt.%. The possible reasons for the variation in microstructure and mechanical properties were discussed.

Influence of Gd Content on the Microstructure and Mechanical Properties of Zn-Al-Mg-Si Alloy

2013 ◽  
Vol 652-654 ◽  
pp. 1059-1062
Author(s):  
Ai Li Wei ◽  
Xing Hai Liu ◽  
Kun Yu Zhang ◽  
Wei Liang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperature ◽  
Room Temperature ◽  
Grain Refining ◽  
Microstructure And Mechanical Properties

The microstructure and mechanical properties of the as-cast Zn-25Al-5Mg-2.5Si-xGd alloys at room and elevated temperature have been investigated in this work. The results show that the addition of element Gd leads to the grain refining and the formation of Al3Gd phase and GdZn12 phase in the microstructure, and the mechanical properties of the alloys rise at first and then drop with the Gd content increasing. When Gd content is 0.8wt.%, the optimization of microstructure and mechanical properties is obtained. The alloy can be increased by 13.9%, 37.7% and 45.6% in tensile strength and be increased by 13.4%, 76.9% and 78.2% in hardness at room temperature, 100°C and 180°C, respectively.

Effects of Sm on Microstructure and Mechanical Properties of Mg-5.5Al -0.5Y Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 267-271
Author(s):  
Chang Qing Li ◽  
Quan An Li ◽  
Xing Yuan Zhang ◽  
Qing Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperature ◽  
Magnesium Alloy ◽  
Temperature Increase ◽  
Room Temperature ◽  
Particle Phase ◽  
Microstructure And Mechanical Properties ◽  
Mg17al12 Phase

The microstructure and mechanical properties of aged Mg-5.5Al-0.5Y magnesium alloy with Sm addition were investigated. The results show that with proper content of Sm addition, the microstructure of Mg-5.5Al-0.5Y magnesium alloy is refined obviously. The quantity of β-Mg17Al12 phase is reduced, and Al2Sm particle phase is formed. With the increase of Sm addition, the mechanical properties of the alloy at room and elevated temperature increase at first, and then decrease. When the content of Sm is up to 1%, the values of tensile strength and elongation at room temperature,150 and 175 are up to their maxima synchronously, 244MPa/20.07%, 217MPa/18.86% and 185MPa/19.15% respectively.

scholarly journals The Effect of Extrusion Temperatures on Microstructure and Mechanical Properties of Mg-1.3Zn-0.5Ca (wt.%) Alloys

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1228
Author(s):  
Honglin Zhang ◽  
Zhigang Xu ◽  
Laszlo J. Kecskes ◽  
Sergey Yarmolenko ◽  
Jagannathan Sankar
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Volume Fraction ◽  
Fiber Texture ◽  
Extrusion Ratio ◽  
Tensile Yield Strength ◽  
Microstructure And Mechanical Properties ◽  
Average Size

The present work mainly investigated the effect of extrusion temperatures on the microstructure and mechanical properties of Mg-1.3Zn-0.5Ca (wt.%) alloys. The alloys were subjected to extrusion at 300 °C, 350 °C, and 400 °C with an extrusion ratio of 9.37. The results demonstrated that both the average size and volume fraction of dynamic recrystallized (DRXed) grains increased with increasing extrusion temperature (DRXed fractions of 0.43, 0.61, and 0.97 for 300 °C, 350 °C, and 400 °C, respectively). Moreover, the as-extruded alloys exhibited a typical basal fiber texture. The alloy extruded at 300 °C had a microstructure composed of fine DRXed grains of ~1.54 µm and strongly textured elongated unDRXed grains. It also had an ultimate tensile strength (UTS) of 355 MPa, tensile yield strength (TYS) of 284 MPa, and an elongation (EL) of 5.7%. In contrast, after extrusion at 400 °C, the microstructure was almost completely DRXed with a greatly weakened texture, resulting in an improved EL of 15.1% and UTS of 274 MPa, TYS of 220 MPa. At the intermediate temperature of 350 °C, the alloy had a UTS of 298 MPa, TYS of 234 MPa, and EL of 12.8%.

scholarly journals Effect of Mn on Microstructure and Mechanical Properties of Al-4Ni Alloy

JOM ◽  
2021 ◽  
Author(s):  
Jiao Fang ◽  
Xixi Dong ◽  
Shouxun Ji
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Aluminum Alloys ◽  
Yield Strength ◽  
Elevated Temperatures ◽  
Strength Loss ◽  
Good Thermal Stability ◽  
Microstructure And Mechanical Properties

AbstractThe application of aluminum alloys at elevated temperatures has been attractive for decades, and Al-Ni-based alloys have recently been recognized as potential candidates. The effect of Mn on Al-4Ni alloy has been investigated in this work. Addition of Mn transformed the eutectics from Al3Ni/α-Al to Al9(Ni,Mn)2/α-Al phases. Mn also improved the tensile strength at both 25°C and 250°C. The yield strength at 25°C increased from 48 MPa to 92 MPa with 1.87% Mn and then to 117 MPa with 3.77% Mn. At 250°C, the yield strength increased from 35 MPa to 82 MPa with 1.87% Mn and then to 101 MPa with 3.77% Mn. The alloys with Mn also showed less strength loss than Al-4Ni alloy at 250°C. The eutectic Al9(Ni,Mn)2 phase showed good thermal stability. No coarsening was observed after 2000 h at 250°C.

Microstructure and Mechanical Properties of 22MnB5 Steel with Different Cooling Method

2013 ◽  
Vol 331 ◽  
pp. 555-558 ◽  
Author(s):  
Hong Wei Liu ◽  
Jing Bo Yu ◽  
Hong Yun Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Volume Fraction ◽  
Air Cooling ◽  
Water Cooling ◽  
Cooling Method ◽  
22Mnb5 Steel ◽  
Microstructure And Mechanical Properties ◽  
Result Show ◽  
Cooling Speed

Microstructure and mechanical properties of 22MnB5 Steel were analysis with different cooling method. The result show that the volume fraction of martensite in 22MnB5 is increased with the rising of cooling speed, the microstructure with air cooling is composed of ferrite and pealite, and the quenched microstructure is 100% martensite with metal die cooling and water cooling, tensile strength increased with the rising of cooling speed. The highest tensile strength is 1569.60MPa with elongation only 2.13% with water cooling method.

scholarly journals Correlation between Microstructure and Mechanical Properties of Heat-Treated Ti–6Al–4V with Fe Alloying

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 854 ◽  
Author(s):  
Yongwei Liu ◽  
Fuwen Chen ◽  
Guanglong Xu ◽  
Yuwen Cui ◽  
Hui Chang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
Phase Interface ◽  
High Strength ◽  
High Plasticity ◽  
High Aging Temperature ◽  
Microstructure And Mechanical Properties

The microstructure and mechanical properties of a newly developed Fe-microalloyed Ti–6Al–4V titanium alloy were investigated after different heat treatments. The volume fraction and the morphological features of the lamellar α phase had significant effects on the alloy’s mechanical performance. A dataset showing the relationship between microstructural features and tensile strength, elongation, and fracture toughness was developed. A high aging temperature resulted in high plasticity and fracture toughness, but relatively low strength. The high strength favored the fine α and the slender β. The high aspect ratio of lamellar α led to high strength but low fracture toughness. The alloy with ~84 vol % α exhibited the highest strength and lowest fracture toughness because the area of its α/β-phase interface was the highest. Optimal comprehensive mechanical performance and heat-treatment procedures were thus obtained from the dataset. Optimal tensile strength, yield strength, elongation, and fracture toughness were 999 and 919 MPa, 10.4%, and 94.4 MPa·m1/2, respectively.

Effect of Nd on the Microstructure and Mechanical Properties of High Aluminum Zinc-Based Alloy

2011 ◽  
Vol 391-392 ◽  
pp. 564-568
Author(s):  
Ai Li Wei ◽  
Kun Yu Zhang ◽  
Xian Rong Li ◽  
Wei Liang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperatures ◽  
Grain Refining ◽  
Micro Hardness ◽  
Microstructure And Mechanical Properties ◽  
Hardness Tests ◽  
And Performance ◽  
Microstructure And Performance ◽  
High Aluminum

This work mainly investigated the influence of element Nd on the microstructure and mechanical properties of the Zn-25Al-5Mg-2.5Si alloys with different Nd contents. The tensile and hardness tests were carried out at room and elevated temperatures. The results show that the addition of element Nd leads to the grain refining and the formation of Al2Nd and NdZn2 phases in the microstructure, and the mechanical properties of the alloys rise at first and then drop with the increasing of Nd content. The optimization of microstructure and performance especially the tensile strength at high temperature is obtained when Nd content is 0.8 wt.%. It can result in increase of tensile strength by 48.8% and micro-hardness by 67.4% at 180。C.

Effects of Er on Microstructure and Mechanical Properties of Mg-Zn-Er-Zr Magnesium Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 105-108 ◽  
Author(s):  
Qu Dong Wang ◽  
Da Quan Li ◽  
Qiang Li ◽  
Wen Jiang Ding
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Temperature ◽  
Solution Treatment ◽  
Precipitation Process ◽  
Strengthening Effect ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Zr Alloy ◽  
Zr Alloys

Microstructure and mechanical properties of Mg-Zn-Er-Zr alloys were characterized in detail. The grain size of as-cast Mg-Zn-Er-Zr alloy was greatly decreased by the Mg-Zn-Er phases formed at grain boundaries. The addition of Er can increase the yield strength (YS) but decrease the ultimate tensile strength (UTS) and elongation of as-cast Mg-Zn-Zr alloy. The thermally stable Mg-Zn-Er phases were just partially dissolved into the matrix during solution treatment. And the addition of Er can prolong the precipitation process of Mg-Zn-Zr alloy. Solution-plus-ageing treatment can increase the strength of both the Mg-Zn-Zr and Mg-Zn-Er-Zr alloys, but the strengthening effect of Mg-Zn-Er-Zr alloy was greatly weakened, for the incompletely solution of Mg-Zn-Er phases. Er can greatly enhance the high temperature elongation of Mg-Zn-Zr alloy, but the increase of high temperature tensile strength was just a little.

Effect of Al on the Microstructure and Mechanical Properties of Hot-Rolled Medium-Mn Steel

2018 ◽  
Vol 941 ◽  
pp. 292-298 ◽  
Author(s):  
Ding Ting Han ◽  
Yun Bo Xu ◽  
Ying Zou ◽  
Zhi Ping Hu ◽  
Shu Qing Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Trip Steel ◽  
Retained Austenite ◽  
Mechanical Stability ◽  
Volume Fraction ◽  
Microstructure And Mechanical Properties ◽  
Medium Mn Steel ◽  
Hot Rolled ◽  
Mn Steel

The present investigation was made to study the effect of Al on the microstructure and mechanical properties of hot-rolled medium-Mn TRIP steel (abbreviated as Al-TRIP). As a contrast, a Si-added medium-Mn TRIP steel (abbreviated as Si-TRIP) was also studied. Addition Al in medium-Mn steel can raise Ac3 temperature, which will restrain austenite transformation and expand the two-phase region, promoting Mn and C elements enriched in austenite. In-depth microstructure and mechanical properties analysis were carried out for the hot-rolled Al-TRIP and Si-TRIP steels in this study. The microstructure was characterized by scanning electron microscope (SEM) and electron probe microanalyzer (EPMA). Volume fraction of retained austenite was measured by D/max2400 X-ray diffractometer (XRD). A dual-phase microstructure consisting of ultra-fine grained intercritical ferrite (IF) and lath-like retained austenite (RA) with high mechanical stability was obtained after annealing at 630°C for 2h for Al-TRIP steel. As prolonging the intercritical annealing time, the stability of RA decreased primarily due to the increase of grain size. The tensile test results indicated that the Al-TRIP steel possessed a better combination of tensile strength and elongation compared to Si-TRIP steel. Excellent mechanical properties with yield strength of 790MPa, tensile strength of 1050MPa, total elongation of 35% and UTS×TEL of 39GPa·% was obtained for the Al-TRIP steel.

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