Effects of Zn Addition on Dynamic Recrystallization of High Strain Rate Rolled Al–Mg Sheets,Metals and Materials International

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Effects of Zn Addition on Dynamic Recrystallization of High Strain Rate Rolled Al–Mg Sheets
Metals and Materials International ( IF 3.3 ) Pub Date : 2021-09-08 , DOI: 10.1007/s12540-021-01030-6
Lu Zhao ₁ , Weijun Xia _{1,

2} , Hongge Yan _{1,

2} , Jihua Chen _{1,

2} , Bin Su _{1,

2}

Affiliation

Effects of Zn addition (0, 0.5, 1.0 and 1.5 wt%) on dynamic recrystallization (DRX) behavior of Al-9.2Mg alloy during high strain rate rolling (with rolling temperature of 400 °C and strain rate of 8.6 s⁻¹) are carefully investigated. The Zn content plays a significant role in the enhanced DRX of Al-9.2Mg alloy. The critical strain (ε_c) and the peak strain (ε_p) are reduced from 0.178 ± 0.002 to 0.102 ± 0.001 and 0.211 ± 0.003 to 0.139 ± 0.002 with the Zn content increasing from 0 to 1.5%, respectively. Almost complete DRX grains are obtained in the Al-9.2Mg-0.5Zn alloy. The DRX volume fraction (F_DRX), the average DRX grain size (AGS), the volume fraction of high-angle grain boundaries (F_HAGBs) and the average grain boundary angle (θ_AV) are 91.5%, 5.6 μm, 91.1% and 37.6 º, respectively. The Zn addition can enhance the formation of deformation bands (DBs) and promote the DRX process by providing the nucleation sites for new grains, while the increased dynamic precipitates inhibit DRX. Continuous dynamic recrystallization (CDRX) is the dominant DRX mechanism, while discontinuous dynamic recrystallization (DDRX) is also existent. Effects of Zn addition on DRX process of the Al–Mg alloys can be ascribed to the more DBs, the reduced stacking fault energy (SFE) and the dynamic precipitates.

Graphic abstract

中文翻译：

添加锌对高应变率轧制铝镁板动态再结晶的影响

Zn添加量（0、0.5、1.0和1.5 wt%）对Al-9.2Mg合金在高应变速率轧制（轧制温度为400°C，应变速率为8.6 s ^-1）过程中动态再结晶（DRX）行为的影响被仔细调查。Zn含量在Al-9.2Mg合金的增强DRX中起重要作用。的临界应变（ε _Ç）和峰值应变（ε _p）从0.178±0.002减少到0.102±0.001 0.211和0.003±0.139至0.002±与Zn含量为0〜1.5％，分别增加。在 Al-9.2Mg-0.5Zn 合金中获得几乎完整的 DRX 晶粒。DRX 体积分数（F _DRX），平均 DRX 晶粒尺寸（AGS)，大角度晶界的体积分数 ( F _HAGBs ) 和平均晶界角 ( θ _AV ) 分别为 91.5%、5.6 μm、91.1% 和 37.6 º。添加锌可以通过为新晶粒提供形核位点来增强变形带 (DB) 的形成并促进 DRX 过程，而增加的动态析出物会抑制 DRX。连续动态再结晶（CDRX）是主要的 DRX 机制，同时不连续动态再结晶（DDRX）也存在。添加锌对 Al-Mg 合金 DRX 过程的影响可归因于更多的 DB、降低的堆垛层错能 (SFE) 和动态析出物。

图形摘要

更新日期：2021-09-08

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