微观组织演变对细晶<strong>Mg-Y-Nd</strong>合金超塑性性能的影响

doi:10.11901/1005.3093.2018.506

材料研究学报

2019, Vol. 33

Issue (6): 452-460 DOI: 10.11901/1005.3093.2018.506

研究论文

本期目录 | 过刊浏览

微观组织演变对细晶Mg-Y-Nd合金超塑性性能的影响

曹耿华,郑振兴(

),刘一雄,王敏,李纬华

广东技术师范大学机电学院广州 510635

Influence of Microstructure Evolution on Superplastic Properties of Fine-grained Mg-Y-Nd Alloy

Genghua CAO,Zhenxing ZHENG(

),Yixiong LIU,Min WANG,Weihua LI

School of Mechanical and Electronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510635, China

引用本文:

曹耿华,郑振兴,刘一雄,王敏,李纬华. 微观组织演变对细晶Mg-Y-Nd合金超塑性性能的影响[J]. 材料研究学报, 2019, 33(6): 452-460.
Genghua CAO, Zhenxing ZHENG, Yixiong LIU, Min WANG, Weihua LI. Influence of Microstructure Evolution on Superplastic Properties of Fine-grained Mg-Y-Nd Alloy[J]. Chinese Journal of Materials Research, 2019, 33(6): 452-460.

全文: PDF(41394 KB) HTML

摘要:

在初始应变速率为2×10^-2~4×10^-4 s^-1，温度为683~758 K的条件下，对用水下搅拌摩擦加工制备的细晶Mg-Y-Nd合金进行高温拉伸实验，研究了微观组织演变对其超塑性性能的影响。结果表明：因为具有细小均匀的微观组织和良好的热稳定性，Mg-Y-Nd合金在733 K和3×10^-3 s^-1初始应变速率下表现出最大的伸长率(967%)，在758 K和2×10^-2 s^-1条件下表现出最优的高应变速率超塑性(900%)。在高温下暴露时间过长导致α-Mg晶粒和第二相颗粒显著长大，使试样的伸长率明显降低；因为第二相颗粒与镁基体之间有良好的变形协调性，在相界处不会产生明显的应力集中，裂纹主要在晶界生成。

关键词 ：金属材料, Mg-Y-Nd合金, 搅拌摩擦加工, 超塑性变形, 微观组织

Abstract：

Superplastic performance of the submerged friction stir processed Mg-Y-Nd alloy was assessed by initial strain rates in range of 2×10^-2 to 4×10^-4 s^-1 at temperatures in range of 683 to 758 K, aiming to reveal the correlation of the microstructure evolution and the superplastic performance of the alloy. Results show that due to the fine-grained and stable microstructure, the alloy exhibits the maximum elongation of 967% by strain rate of 3×10^-3 s^-1 at 733 K, and the excellent high strain rate superplasticity of 900% by 2×10^-2 s^-1 at 758 K respectively. The average size of α-Mg grains and secondary phase particles remarkably increased when the alloy subjected to high temperature tensile tests for long time, as a result, the elongation of the alloy significantly decreased. Cavities easily formed at grain boundaries instead of the interface of secondary particles and matrix, which may be responsible to the good deformation compatibility between particles and matrix.

Key words： metallic materials Mg-Y-Nd alloy friction stir processing superplastic deformation microstructure

收稿日期: 2018-08-16

ZTFLH:

TG146.22

基金资助:广东省自然科学基金(2017A030310630);广东省省级科技计划(2017A070715012);广东省创新强校项目(2017KTSCX115);广东省创新强校项目(2015KTSCX084)

作者简介: 曹耿华，男，1986年生，博士，讲师

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.506 或 https://www.cjmr.org/CN/Y2019/V33/I6/452

图1 高温拉伸断裂试样的夹持区域、标距区域和裂纹尖端取样位置

图2 铸态和SFSP试样的典型微观组织图片

图3 SFSP试样在不同测试条件下的高温拉伸宏观形貌

图4 在不同测试条件下夹持区域的微观组织形貌

图5 不同测试条件下标距区域的晶粒组织形貌

图6 不同测试条件下标距区域的第二相颗粒形貌

图7 SFSP试样在不同测试条件下的超塑性性能和微观组织演变数据汇总

图8 不同测试条件下标距区域的表面形貌

图9 在733 K和4×10-4 s-1条件下断裂试样近裂纹尖端区域的表面形貌

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