首页|The effect of precipitates on the fracture behavior and tensile properties of Mg-14Gd-0.5Zr(wt.％)alloy

The effect of precipitates on the fracture behavior and tensile properties of Mg-14Gd-0.5Zr(wt.％)alloy

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
The effect of precipitation aging on the fracture behavior of cast Mg-14.23Gd-0.45Zr(wt.％)alloy at room temperature has been studied in this work.Uniaxial tensile and three-point bending tests were conducted on samples peak-aged at 175,200,225,and 250 ℃.Notably,samples aged at 175 ℃ and 200 ℃ exhibited premature fracture during the uniaxial tensile test.Through fractographic observations of the tensile test samples and electron backscattered diffraction(EBSD)analysis on the samples sub-jected to three-point bending tests,a preferential formation of cleavage cracks in samples aged at 175 ℃ and 200 ℃ was identified as the reason for their premature fracture.The X-ray diffraction(XRD)results and transmission electron microscopy(TEM)observations of precipitates indicate that the dominant strengthening precipitates in all peak-aged samples are of theβ'phase,and their size significantly influences the formation of cleavage cracks.This phenomenon is attributed to the shearing mechanism of precipitates.Specifically,the smaller β'precipitates formed under the aging temperature of 175-200 ℃ are susceptible to dislocation shearing,leading to the formation of cleavage cracks.In contrast,the larger size of β'precipitates formed under the aging temperature of 225-250 ℃ provides resistance to shearing,resulting in the restrained formation of cleavage cracks and ultimately contributing to the enhancement of the ultimate tensile strength.

FractureMg-RE alloyPrecipitateAging treatmentMechanical property

Chunxiao Li、Jianxiong Wei、Jianfeng Jin、Hong Yan、Zhiwei Shan、Yaozong Mao、Rongshi Chen

展开 >

School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China

Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

Beijing Institute of Space Long March Vehicle,Beijing 100076,China

School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China

Center for Advancing Materials Performance From the Nanoscale(CAMP-Nano)& Hysitron Applied Research Center in China(HARCC),State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China

Key Laboratory of Advanced Aluminium Materials and Technology,Binzhou Institute of Technology,Weiqiao-UCAS Science and Technology Park,Binzhou 256606,China

展开 >

国家自然科学基金国家自然科学基金山东省自然科学基金辽宁省自然科学基金Bintech-IMR Research and Development Program

5227110751701218ZR2021ME2412020-MS-004GYY-JSBU-2022-012

2024

10.1016/j.jmst.2023.08.062

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.180(13)
  • 69