Effects of Repeated Plastic Working（RPW） on Microstructure and Mechanical Properties of Mg<sub>2</sub>Si/Mg-5Zn-2.5Er Composites

Qin Yaling; Du Wenbo; Wang Xudong; Wang Zhaohui; Li Shubo

Views : 0 下载量: 110 CSCD: 1

Export
Share
Collection
Album

Effects of Repeated Plastic Working（RPW） on Microstructure and Mechanical Properties of Mg₂Si/Mg-5Zn-2.5Er Composites
Vol. 30, Issue 6, Pages: 546-549(2010)
Published： 2010 ，
DOI：

扫描看全文

[1]秦亚灵,杜文博,王旭东,王朝辉,李淑波.多次循环塑性变形对Mg_2Si/Mg-5Zn-2.5Er复合材料组织与性能的影响[J].特种铸造及有色合金,2010,30(06):546-549+595.

Qin Yaling, Du Wenbo, Wang Xudong, et al. Effects of Repeated Plastic Working（RPW） on Microstructure and Mechanical Properties of Mg₂Si/Mg-5Zn-2.5Er Composites. [J]. Special Casting & Nonferrous Alloys 30(6):546-549(2010)
[1]秦亚灵,杜文博,王旭东,王朝辉,李淑波.多次循环塑性变形对Mg_2Si/Mg-5Zn-2.5Er复合材料组织与性能的影响[J].特种铸造及有色合金,2010,30(06):546-549+595. DOI：

Qin Yaling, Du Wenbo, Wang Xudong, et al. Effects of Repeated Plastic Working（RPW） on Microstructure and Mechanical Properties of Mg₂Si/Mg-5Zn-2.5Er Composites. [J]. Special Casting & Nonferrous Alloys 30(6):546-549(2010) DOI：

摘要

经多次循环塑性变形（RPW）、固相原位合成和挤压成型

制备了Mg2Si/Mg-5Zn-2.5Er复合材料。多次循环塑性变形次数分别为100次、200次、300次和400次。通过XRD、SEM、OM和力学性能测试等方法

研究了RPW次数对复合材料组织、性能的影响规律。结果表明

随着RPW次数的增加

增强相粒子Mg2Si的尺寸不断减小、分布趋向均匀。当RPW次数为200次时

复合材料的综合性能最佳。其平均晶粒尺寸为1.8μm

较未经RPW加工试样降低了81.6%

晶粒的尺寸变化主要是冷变形过程的晶粒细化与高温反应以及热挤压过程中动态再结晶的晶粒长大相互作用的结果。其抗拉强度为394MPa

比未经RPW加工试样提高了25.4%

伸长率为5.5%。通过对增强机制的研究

发现多次循环塑性变形制备的复合材料的主要强化机制是晶粒细化。

Abstract

Mg2Si/Mg-5Zn-2.5Er composites were fabricated by repeated plastic working （RPW） via solid state reaction and hot extrusion. Number of RPW was 100

200

300 and 400

respectively. Effects of RPW times on microstructure and mechanical properties of the composites were investigated by XRD （X-ray diffraction）

SEM （scanning electron microscope） and OM （optical microscope）. The results show that with increasing in RPW times

size of Mg2Si phase is gradually decreased with more uniform distribution. With 200 times RPW

the composites exhibit desirable comprehensive mechanical properties

and average grain size in the composites reaches 1.8 μm

decreased by 81.6% compared with that of samples without RPW

which is attributed to the grain refinement caused by repeated plastic deformation and grain growth caused by dynamic recrystallization during solid state reaction and hot extrusion. In addition

tensile strength reaches 394MPa

increased by 25.4% compared with that of ones without RPW

and elongation makes 5.5%. The strengthening mechanism of the prepared composites is characterized by grain refinement.