Kim Kibeom, Ji Yebin, Kim Kwonhoo, Park Minsoo
Department of Marine Design Convergence Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea.
Department of Metallurgical Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea.
Materials (Basel). 2023 Mar 16;16(6):2380. doi: 10.3390/ma16062380.
Magnesium and its alloys have been restricted in their industrial applications due to problems related to their formability. To overcome this issue, controlling the crystallographic texture is important, and the texture formation mechanism should be investigated in relation to factors including deformation conditions and solute atoms. In particular, the effects of solute atoms on the texture formation behavior should be further analyzed because they can considerably affect the deformation behavior. Thus, in this study, to clarify the effect of aluminum concentration on the texture formation behavior and microstructure, high-temperature uniaxial compression tests were conducted on three types of AZ-series magnesium alloys (AZ31, AZ61, and AZ91). Compression was conducted at 673 K and 723 K, with strain rates of 0.05 s and 0.005 s, up to a true strain of -1.0. Cylindrical specimens were prepared from a rolled plate that had a (0001) basal texture and was compressed parallel to the c-axis of the grains. Consequently, work softening and fiber texture formation were observed in all the specimens. During the deformation, the development of grain boundaries, which is a typical characteristic of continuous dynamic recrystallization (CDRX), was observed, and the (0001) texture was highly developed with increasing Al content. Although each alloy was associated with the same deformation conditions and mechanisms, the AZ31 alloy exhibited a non-basal texture component. The stacking fault energy contributed to the generation of slip systems and gliding, and it was seen as the main reason for texture variation.
镁及其合金由于其可成形性方面的问题，在工业应用中受到限制。为克服这一问题，控制晶体织构很重要，并且应结合包括变形条件和溶质原子等因素来研究织构形成机制。特别是，溶质原子对织构形成行为的影响应进一步分析，因为它们会显著影响变形行为。因此，在本研究中，为阐明铝浓度对织构形成行为和微观结构的影响，对三种AZ系列镁合金（AZ31、AZ61和AZ91）进行了高温单轴压缩试验。压缩在673 K和723 K下进行，应变速率分别为0.05 s⁻¹和0.005 s⁻¹，直至真应变达到-1.0。圆柱形试样由具有（0001）基面织构且沿晶粒c轴平行压缩的轧制板材制备而成。结果，在所有试样中均观察到加工软化和纤维织构形成。在变形过程中，观察到连续动态再结晶（CDRX）的典型特征——晶界的发展，并且随着Al含量的增加，（0001）织构高度发展。尽管每种合金都具有相同的变形条件和机制，但AZ31合金表现出非基面织构组分。堆垛层错能促成了滑移系的产生和滑移，并且被视为织构变化的主要原因。
