半固态粉末成形温度对Mg-6Zn-<em>x</em>Mn显微组织和力学性能的影响

doi:10.19976/j.cnki.43-1448/TF.2022050

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摘要使用金属镁、锌、锰粉为原料,采用半固态粉末成形法在540~600 ℃下制备Mg-6Zn-xMn(x=0.5%和1.0%,质量分数)合金,通过光学显微镜、X射线衍射仪、扫描电镜、显微硬度仪、万能试验机、电化学测试等表征和测试手段,研究成形温度对合金物相和晶粒大小、抗压强度和显微硬度,以及耐腐蚀性能的影响。结果表明,随成形温度升高,合金的相对密度和平均晶粒尺寸增加,但显微硬度和抗压强度降低。成形温度从540 ℃升高至 600 ℃,Mg-6Zn-0.5Mn和Mg-6Zn-1.0Mn合金的抗压强度从382.8 MPa和372.1 MPa下降至348.9 MPa和353.1 MPa(分别下降约8.9%和5.4%),主要是由于成形温度升高,晶界处生成更多的氧化物夹杂,从而使合金的抗压强度降低。合金的显微硬度(HV)均在95.1以上,600 ℃成形的Mg-6Zn-0.5/1.0Mn合金具有最好的耐腐蚀性能,电化学腐蚀速率分别为0.263 mm/a和0.183 mm/a。

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	杨上挥
	罗霞
	李铭宇
	刘嘉兴
	吕春阳
	黄静
	包菲菲
	黄本生

关键词 ：半固态粉末成形, 医用镁合金, 力学性能, 抗压强度, 降解性能

Abstract：Using metal magnesium, zinc, manganese powders as raw materials, Mg-6Zn-xMn (x=0.5%, 1.0%) magnesium alloys were prepared at a temperature of 540-600 ℃ by semi-solid powder moulding method. The effects of forming temperature on the microstructures (phase and grain size), mechanical properties (compressive strength and microhardness), and corrosion resistance of the alloys were investigated by means of optical microscope, X-ray diffractometer, scanning electron microscope, microhardness tester, universal testing machine, and electrochemical test. The results show that with the increase of forming temperature, the relative density and average grain size increase, while the microhardness and compressive strength decrease. With the forming temperature increasing from 540 ℃ to 600 ℃, the compressive strength of Mg-6Zn-0.5Mn and Mg-6Zn-1.0Mn alloys decreases from 382.8 MPa and 372.1 MPa to 348.9 MPa and 353.1 MPa (decreasing by about 8.9% and 5.4%, respectively), mainly as the forming temperature increases, more oxide inclusions are generated at the grain boundaries, thereby reducing the compressive strength of the alloy. The microhardness (HV) of the alloys is above 95.1, and Mg-6Zn-0.5/1.0Mn alloy prepared at 600 ℃ has the lowest degradation rate of 0.263 mm/a and 0.183 mm/a, respectively.

Key words： semi-solid powder moulding medical magnesium alloy mechanical properties compressive strength degradation property

收稿日期: 2022-04-12 出版日期: 2022-09-14

ZTFLH:

TG146.2

基金资助:四川省科技厅国际合作项目(2020YFH0151); 国家自然科学基金资助项目(51704255)

通讯作者: 罗霞,副教授,博士。电话：15680824324;E-mail: winifreed@163.com

引用本文:

杨上挥, 罗霞, 李铭宇, 刘嘉兴, 吕春阳, 黄静, 包菲菲, 黄本生. 半固态粉末成形温度对Mg-6Zn-xMn显微组织和力学性能的影响[J]. 粉末冶金材料科学与工程, 2022, 27(4): 372-381.
YANG Shanghui, LUO Xia, LI Mingyu, LIU Jiaxing, LÜ Chunyang, HUANG Jing, BAO Feifei, HUANG Bensheng. Effects of temperature on microstructure and mechanical properties of Mg-6Zn-xMn alloy prepared by semi-solid powder moulding. Materials Science and Engineering of Powder Metallurgy, 2022, 27(4): 372-381.

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http://pmbjb.csu.edu.cn/CN/10.19976/j.cnki.43-1448/TF.2022050 或 http://pmbjb.csu.edu.cn/CN/Y2022/V27/I4/372

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