Microstructure Evolution of AZ80 Magnesium Alloy during Multi-Directional Forging Process
Microstructure Evolution of AZ80 Magnesium Alloy during Multi-Directional Forging Process
复制标题
AZ80镁合金多向锻造过程中的组织演变
DOI：
10.2320/matertrans.m2013251
复制
发表时间：
2014-02-01
影响因子：
1.2
通讯作者：
Cui, Jianzhong
中科院分区：
文献类型：
--
作者：
Zhu, Qingfeng;Li, Lei;Cui, Jianzhong
研究了镁合金AZ 80在683 ~ 573 K温度范围内的多向锻造晶粒细化。通过从一个道次到另一个道次改变加载方向，进行了累积真应变约为7的试验。组织变化的特点是在时效过程中，试样中出现了细小的动态再结晶（DRXed）晶粒（含有大量的动态粒状Mg 17 Al 12相）和粗大的DRXed晶粒（不含Mg 17 Al 12相）交替出现，细晶区扩大，细晶区的DRXed晶粒细化。Mg 17 Al 12相的不均匀动态析出可能是由于Mg基体中Al含量分布不均匀所致。这些Mg 17 Al 12相阻碍了动态再结晶晶粒的生长，从而导致了随着温度的降低，再结晶过程中细晶区的形成和扩展。[doi：10.2320/matertrans.M2013251]
Grain refinement of a magnesium alloy, AZ80, was studied in multi-directional forging (MDF) with decreasing temperatures from 683 to 573K. The MDF was carried out up to accumulative true strains of around 7 with changing the loading direction from pass to pass. The structural changes are characterized by the alternate appearance of fine dynamic recrystallized (DRXed) grains (with many dynamic granular Mg17Al12 phases) and coarse DRXed grains (without Mg17Al12 phases) in the sample, the expansion of the fine grains area, and the refinement of (DRXed) grains in the fine grains area during the MDF process. The non-uniform dynamic precipitation of the Mg17Al12 phase may attribute to the inhomogenous Al content distribution in the Mg matrix. These Mg17Al12 phase retards the growth of the DRX grains, which in turn results in the formation and the expansion of the fine grains area during the MDF process with decreasing temperature. [doi:10.2320/matertrans.M2013251]