目的 研究LAZ931镁锂合金的热变形行为及其对微观组织的影响规律以及热变形参数对力学性能的影响。方法 通过热压缩变形实验获得了LAZ931镁锂合金在变形温度为150~300 ℃、应变速率为10-3~1 s-1条件下的热压缩曲线,建立了其本构模型与热加工图,研究了热变形对微观组织的影响规律,并采用等温锻造的方法制备了锻态镁锂合金,研究了变形工艺参数对力学性能的影响规律。结果 LAZ931镁锂合金在热变形过程中通过动态再结晶显著细化了微观组织,且随着变形温度的升高和应变速率的降低,两相晶粒尺寸逐渐长大;等温锻造可显著改善合金力学性能,其拉伸强度与延伸率随变形温度的升高和应变速率的降低而逐渐降低,在250 ℃、10-2 s-1名义条件下进行锻造后,其屈服强度、抗拉强度、延伸率分别达到175 MPa、195 MPa和21.8%,较原始材料分别提升了28%、18%和82%。结论 通过分析实验数据可以得出LAZ931镁锂合金具有优异的热加工性能。
Abstract
The work aims to investigate the thermal deformation behavior of LAZ931 MG-Li alloy, the impact of thermal deformation on its microstructure, and the influence of thermal deformation parameters on its mechanical properties. A hot compression deformation test was conducted on LAZ931 MG-Li alloy within a temperature range of 150-300 ℃ and strain rates of 10-3 to 1 s-1, yielding its hot compression curve. Its constitutive model and hot working diagram were established. The effect of hot deformation on the microstructure was examined. As-cast MG-li alloy was prepared by isothermal forging. The influence of deformation parameters on mechanical properties was explored. The microstructure of LAZ931 MLi-Laz931 alloy was significantly refined through dynamic recrystallization during the hot deformation process, and the grain size of the two phases gradually increased with the rise of deformation temperature and the decrease of the strain rate. Isothermal forging could significantly improve the mechanical properties of the alloy. As the deformation temperature increased and the strain rate decreased, the alloy's tensile strength and elongation exhibited a gradual decline. After forging at 250 ℃ and 10-2 s-1, the yield strength, tensile strength, and elongation reached 175 MPa, 195 MPa, and 21.8%, respectively. These values represent increases of 28%, 18%, and 82% compared with the original material. In conclusion, LAZ931 MG-Li alloy exhibits excellent hot working performance.
关键词
镁锂合金 /
热变形 /
组织演化 /
动态再结晶 /
力学性能
Key words
magnesium-lithium alloy /
heat deformation /
organizational evolution /
dynamic recrystallization /
mechanical property
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