AZ80镁合金变路径多向锻工艺及孪晶主导的变形机制研究  

Study on multidirectional forging process of AZ80 magnesium alloy and twin-led deformation mechanism

作　　者：鲁毅 赵熹[1] 李树昌 Lu Yi;Zhao Xi;Li Shuchang(School of Aerospace Engineering,North University of China,Shanxi Taiyuan,030051,China;School of Mechanical and Electrical Engineering,North University of China,Shanxi Taiyuan,030051,China)

机构地区：[1]中北大学航空宇航学院,山西太原030051 [2]中北大学机电工程学院,山西太原030051

出　　处：《机械设计与制造工程》2025年第4期27-32,共6页Machine Design and Manufacturing Engineering

基　　金：中北大学2022年科技项目(20221878)。

摘　　要：针对镁合金多向锻造塑性变形机制理论尚不完善的问题,设计了室温和液氮变换路径方案的多向锻造工艺实验,探讨室温和液氮条件下AZ80镁合金多向锻造过程的塑性变形机制。结果表明,低应变液氮条件下的孪晶相互作用更为密集,堆积的高位错应力集中区域提供了更多的孪晶形核点,AZ80镁合金的力学性能提升效果显著。在变换路径后,RT-2+CT-1道次的AZ80镁合金孪生变体大量激活以协调变形;而RT-2+CT-2道次的AZ80镁合金在变形过程中,更多二次孪晶变体的激活取代了室温下的退孪行为,从而使其力学性能可以继续提升。Aiming at the problem that the theory of plastic deformation mechanism of magnesium alloy multi-direction forging is not perfect,the multi-direction forging process experiment of room temperature and liquid nitrogen transformation path scheme is designed to discuss the plastic deformation mechanism of AZ80 magnesium alloy multi-direction forging process at room temperature and liquid nitrogen conditions.The results show that the twin interaction is more intensive under the condition of low strain liquid nitrogen,and the high misplaced stress concentration area provides more twin nucleation points,and the mechanical properties of AZ80 magnesium alloy are better improved.The AZ80 magnesium alloy twin variants of RT-2+CT-1 pass are activated to coordinate the deformation.In the deformation process of AZ80 magnesium alloy with RT-2+CT-2 pass,the activation and mechanical properties can be further improved.

关 键 词：AZ80镁合金 多向锻 孪晶变体 晶粒细化 

分 类 号：TG146.22[一般工业技术—材料科学与工程]