scholarly journals Effects of extrusion parameters and post-heat treatments on microstructures and mechanical properties of extrusion weld seams in 2195 Al-Li alloy profiles

2020 ◽  
Vol 9 (3) ◽  
pp. 2662-2678 ◽  
Author(s):  
Xiao Xu ◽  
Guoqun Zhao ◽  
Shubin Yu ◽  
Yongxiao Wang ◽  
Xiaoxue Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatments ◽  
Microstructures And Mechanical Properties ◽  
Weld Seams

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 heat treatments on the microstructures and mechanical properties of Mg–3Nd–0.2Zn–0.4Zr (wt.%) alloy

2008 ◽  
Vol 486 (1-2) ◽  
pp. 183-192 ◽  
Author(s):  
Fu Penghuai ◽  
Peng Liming ◽  
Jiang Haiyan ◽  
Chang Jianwei ◽  
Zhai Chunquan
Keyword(s):  
Mechanical Properties ◽  
Heat Treatments ◽  
Microstructures And Mechanical Properties

scholarly journals Effects of Heat Treatments on Microstructures and Mechanical Properties of Ti6Al4V Alloy Produced by Laser Solid Forming

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 346
Author(s):  
Fei Li ◽  
Bojin Qi ◽  
Yongxin Zhang ◽  
Wei Guo ◽  
Peng Peng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Heat Treatments ◽  
Ti6al4v Alloy ◽  
Vacuum Condition ◽  
Residual Tensile Stress ◽  
Α Phase ◽  
Laser Solid Forming ◽  
Anisotropic Mechanical Properties ◽  
Microstructures And Mechanical Properties

The steep thermal gradient and complicated thermal cycle occur in the fabrication of Ti6Al4V alloy during laser solid forming (LSF). That leads to obvious anisotropic mechanical properties and requires essential heat treatments to improve its performance. In this work, different heat treatment strategies under vacuum condition were used to study the evolution of microstructures and mechanical properties of Ti6Al4V alloy produced by LSF. The results show that transformation from α phase into lamellar α + β dual-phases structure is introduced at low temperature (550 °C), and the α phase is broken and refined at higher temperature (800 °C). Tensile tests present the increase of elongations in the horizontal and vertical directions by 12.4% and 13.2% for specimens treated by two-step heat treatment (750 °C × 4 h + 500 °C × 1 h). Fatigue crack growth (FCG) lives of LSFed Ti6Al4V alloy after different heat treatments were improved due to the elimination of residual tensile stress and the transformation of α phase into α + β dual-phase structure. Specimens treated at 800 °C for 4 h exhibit a higher fatigue life among those heat-treated alloys. The low sensitivities of the FCG behavior in the Paris-zone to different heat treatments under vacuum condition are explored in the FCG testing of Ti6Al4V alloy.

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