高速冲击载荷下预压缩<strong>AZ31</strong>镁合金的退孪生行为与动态力学性能

doi:10.11900/0412.1961.2021.00117

金属学报

2022, Vol. 58

Issue (5): 660-672 DOI: 10.11900/0412.1961.2021.00117

研究论文

本期目录 | 过刊浏览

高速冲击载荷下预压缩AZ31镁合金的退孪生行为与动态力学性能

陈扬, 毛萍莉(

), 刘正, 王志, 曹耕晟

沈阳工业大学材料科学与工程学院辽宁省镁合金及其成型技术重点实验室沈阳 110870

Detwinning Behaviors and Dynamic Mechanical Properties of Precompressed AZ31 Magnesium Alloy Subjected to High Strain Rates Impact

CHEN Yang, MAO Pingli(

), LIU Zheng, WANG Zhi, CAO Gengsheng

Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province, School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

引用本文:

陈扬, 毛萍莉, 刘正, 王志, 曹耕晟. 高速冲击载荷下预压缩AZ31镁合金的退孪生行为与动态力学性能[J]. 金属学报, 2022, 58(5): 660-672.
Yang CHEN, Pingli MAO, Zheng LIU, Zhi WANG, Gengsheng CAO. Detwinning Behaviors and Dynamic Mechanical Properties of Precompressed AZ31 Magnesium Alloy Subjected to High Strain Rates Impact[J]. Acta Metall Sin, 2022, 58(5): 660-672.

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摘要:

为研究高应变速率冲击载荷下预压缩轧制态AZ31镁合金的退孪生行为与动态力学性能,将原始试样沿轧制方向(RD)进行真应变为4%的准静态预压缩,引入大量的{ $10 1 ¯ 2$ }拉伸孪晶。利用分离式Hopkinson压杆(SHPB)装置对原始及预压缩AZ31镁合金样品沿板材法向(ND)进行应变速率为700、1000、1300和1600 s^-1的高速冲击实验,并利用EBSD技术对原始试样、预压缩试样以及不同应变速率下的冲击试样进行微观组织分析。结果表明,相比于原始试样,预压缩AZ31镁合金试样内的基面织构强度明显减弱并形成c轴与RD平行的孪晶织构,由于拉伸孪晶界对母晶粒的分割作用使得平均晶粒尺寸明显降低。预压缩AZ31镁合金试样沿ND高速冲击时的主要变形机制为退孪生,随着冲击应变速率的增大,孪晶织构逐渐恢复至初始的强基面织构,孪晶面积分数和孪晶平均厚度均逐渐降低,平均晶粒尺寸逐渐增大。此外,沿ND冲击原始试样相比于预压缩试样具有更高的强度和更低的塑性,且在塑性变形过程中预压缩试样呈现出更加明显的应变速率敏感性。

关键词 ： AZ31镁合金, 预压缩, 高速冲击, 退孪生

Abstract：

To investigate the detwinning behaviors and dynamic mechanical properties of a precompressed rolled AZ31 magnesium alloy sheet impacted under high strain rates, the as-received sheet was precompressed along the rolling direction (RD) to the true strain of 4% for inducing { $10 1 ¯ 2$ } tensile twins. The as-received and precompressed rolled AZ31 magnesium alloy sheets were impacted along the normal direction (ND) using a split Hopkinson pressure bar experiment apparatus at strain rates of 700, 1000, 1300, and 1600 s^-1. Microstructural characteristics of the as-received, precompressed, and impacted specimens were analyzed and compared by an electron backscatter diffraction technology. The results show that in the precompressed specimen, the density of the basal texture was weakened and a new twin texture with the c-axis paralled to RD was formed. The average grain size of the precompressed specimen decreased visibly as a result of the parent grains being subdivided by tensile twin boundaries. The dominant deformation mechanism of the precompressed rolled AZ31 magnesium alloy impacted along ND is detwinning. With increasing the strain rate, the initial basal texture recovered, the average grain size increased, and the average twin thickness decreased. Compared with the precompressed specimen, the as-received specimen impacted along ND exhibited higher strength and lower formability. The precompressed specimen demonstrated greater strain rate sensitivity during plastic deformation.

Key words： AZ31 magnesium alloy precompression high strain rate impact detwinning

收稿日期: 2021-03-23

ZTFLH:

TG146.2

基金资助:辽宁省兴辽英才计划项目(XLYC1908006)

作者简介: 陈扬,男,1986年生,博士生,高级工程师

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00117 或 https://www.ams.org.cn/CN/Y2022/V58/I5/660

图1 均匀化处理后轧制态AZ31镁合金板材的反极图、晶界图、晶粒尺寸分布图、{0001}极图和取向差角分布图

图2 沿轧制方向预压缩4%后轧制态AZ31镁合金板材的反极图、晶界图、{0001}极图、晶粒尺寸分布图和取向差角分布图

图3 图2a中矩形区域局部放大图及沿图3a中箭头方向的取向差角分布图

图4 预压缩轧制态AZ31镁合金沿法向(ND)冲击应变速率为700 s-1时的反极图、晶界图、晶粒尺寸分布图、{0001}极图和取向差角分布图

图5 预压缩轧制态AZ31镁合金沿ND冲击应变速率为1000 s-1时的反极图、晶界图、晶粒尺寸分布图、{0001}极图和取向差角分布图

图6 预压缩轧制态AZ31镁合金试样沿ND冲击应变速率为1300 s-1时的反极图、晶界图、晶粒尺寸分布图、{0001}极图和取向差角分布图

图7 预压缩轧制态AZ31镁合金试样沿ND冲击应变速率为1600 s-1时的反极图、晶界图、晶粒尺寸分布图、{0001}极图和取向差角分布图

图8 预压缩轧制态AZ31镁合金试样和经不同应变速率冲击试样内母晶粒中的孪晶数量分布图

图9 沿ND不同冲击应变速率下预压缩AZ31镁合金试样中残余拉伸孪晶面积分数和孪晶厚度

图10 原始及预压缩轧制态AZ31镁合金沿ND在不同冲击应变速率下的真应力-真应变曲线

Specimen	$ε ˙$ = 700 s^-1		$ε ˙$ = 1000 s^-1		$ε ˙$ = 1300 s^-1		$ε ˙$ = 1600 s^-1
	σ_s	σ_p	σ_s	σ_p	σ_s	σ_p	σ_s	σ_p
As-received	113.2	345.6	128.9	419.7	135.4	458.6	144.5	498.1
Precompressed	98.7	228.1	102.5	348.8	107.3	415.2	112.2	488.8

表1 原始试样与预压缩AZ31镁合金试样沿ND在不同应变速率下冲击的屈服应力与峰值应力 (MPa)

Specimen	$ε$ = 0.005	$ε$ = 0.01	$ε$ = 0.025	$ε$ = 0.05	$m ¯$
As-received	0.227	0.269	0.232	0.166	0.224
Precompressed	0.301	0.179	0.295	0.438	0.303

表2 应变速率为700和1600 s-1时原始试样与预压缩试样沿ND冲击的应变速率敏感指数

图11 退孪生晶粒取向变化示意图

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