Cu元素对挤压剪切ZK60合金组织性能及织构演变的影响

doi:10.11901/1005.3093.2019.281

材料研究学报

2019, Vol. 33

Issue (12): 881-891 DOI: 10.11901/1005.3093.2019.281

研究论文

本期目录 | 过刊浏览

Cu元素对挤压剪切ZK60合金组织性能及织构演变的影响

代帅^1,²,王峰^1,²(

),王志^1,²,刘正^1,²,毛萍莉^1,²

1. 沈阳工业大学材料科学与工程学院沈阳 110870
2. 辽宁省镁合金及成形技术重点实验室沈阳 110870

Effect of Cu Addition on Microstructure, Mechanical Property and Texture Evolution of Extrusion-shearing ZK60 Mg-alloy

Shuai DAI^1,²,Feng WANG^1,²(

),Zhi WANG^1,²,Zheng LIU^1,²,Pingli MAO^1,²

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

引用本文:

代帅,王峰,王志,刘正,毛萍莉. Cu元素对挤压剪切ZK60合金组织性能及织构演变的影响[J]. 材料研究学报, 2019, 33(12): 881-891.
Shuai DAI, Feng WANG, Zhi WANG, Zheng LIU, Pingli MAO. Effect of Cu Addition on Microstructure, Mechanical Property and Texture Evolution of Extrusion-shearing ZK60 Mg-alloy[J]. Chinese Journal of Materials Research, 2019, 33(12): 881-891.

全文: PDF(8397 KB) HTML

摘要:

采用金属型铸造方法制备ZK60及ZK60+1.0Cu(质量分数，%)合金，并对两种合金进行均匀化热处理与两步复合挤压剪切成形。利用OM、SEM、EDS、XRD、EBSD、TEM及室温拉伸-压缩实验研究了挤压剪切合金的显微组织、相组成及力学性能。结果表明：向ZK60合金中加入1.0Cu后，合金α-Mg基体中出现三元MgZnCu相。ZK60+1.0Cu合金成形区平均晶粒尺寸为1.56 μm，其远小于ZK60合金(4.68 μm)，且MgZnCu相附近存在着尺寸为300±45 nm的亚晶粒。相比于ZK60合金，ZK60+1.0Cu合金成形区拥有着较弱的{0001}基面织构，且织构基极和挤压方向(ED)夹角发生转变，造成ZK60+1.0Cu合金成形区中存在着更多易于{0001}<11 $2 ˉ$ 0>基面滑移启动的动态再结晶(DRX)晶粒。ZK60+1.0Cu合金成形区的拉伸及压缩强度明显高于ZK60合金，其主要归因于晶界强化，而拉伸伸长率的降低和硬质MgZnCu相带来的微孔聚集有关。

关键词 ：金属材料, Mg-Zn-Cu-Zr合金, 显微组织, 织构演变, 力学性能

Abstract：

The as-cast Mg-alloys ZK60 and ZK60+1.0Cu (mass fraction, %) were fabricated by permanent mold casting, then, the homogenization heat treatment and two-step extrusion-shearing process were performed for the alloys. The microstructure, phase constitution and mechanical properties of the extrusion-shearing alloys were characterized by means of OM, SEM, EDS, XRD, EBSD, TEM and tensile-compression test at ambient temperature. Results indicated that the ternary MgZnCu phase could be observed in the interiors of α-Mg matrix of the alloy with addition of 1.0Cu. The quantitatively measured average grain size of α-Mg matrix of ZK60+1.0Cu alloy in the forming area was 1.56 μm, which was much less than that of ZK60 alloy (4.68 μm). Furthermore, the sub-grains of 300±45 nm in size were observed around the MgZnCu phase. The ZK60+1.0Cu alloy in the forming area possessed weaker {0001} basal texture while the angle between basal pole and extrusion direction (ED) was changed as compared with ZK60 alloy, resulted in the existence of more dynamic recrystallization (DRX) grains, which was beneficial to {0001}<11 $2 ˉ$ 0> basal slip. The tensile and compressive strength of ZK60+1.0Cu alloy in the forming area was obviously higher than that of ZK60 alloy owing to the grain boundary strengthening, and the occurrence of micro-voids near or within the fractured MgZnCu phase mainly accounted for the decrease of tensile elongation.

Key words： metallic materials Mg-Zn-Cu-Zr alloy microstructure texture evolution mechanical property

收稿日期: 2019-05-29

ZTFLH:

TG146.2

基金资助:国家自然科学基金(51504153);辽宁省“兴辽英才计划”(XLYC1807021);辽宁省高等学校基本科研项目(LQGD2017032);沈阳市中青年科技创新人才支持计划(RC180111)

作者简介: 代帅，男，1992年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.281 或 https://www.cjmr.org/CN/Y2019/V33/I12/881

表1 合金的化学成分

图1 两步复合挤压剪切实验流程示意图

图2 挤压剪切合金挤压区及成形区中显微组织的OM像

图3 挤压剪切合金成形区SEM像及EDS分析

图4 挤压剪切ZK60+1.0Cu合金成形区中SEM像及面扫描元素分布图

图5 挤压剪切ZK60及ZK60+1.0Cu合金XRD图谱

图6 挤压剪切ZK60+1.0Cu合金成形区的TEM像

图7 挤压剪切合金EBSD取向图及微观极图

图8 挤压剪切合金应变分布及局部区域极图

图9 挤压剪切合金成形区取向差分布图

图10 挤压剪切合金成形区基面滑移Schmid因子分布图

图11 挤压剪切合金成形区拉伸及压缩应力-应变曲线

表2 挤压剪切合金成形区拉伸及压缩实验结果

图12 挤压剪切合金成形区断口形貌、纵切面SEM像及EDS分析

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