机械球磨法制备AZ31合金及其组织性能研究

发布时间：2018-02-28 05:00

  本文关键词： 机械球磨法 AZ合金 显微组织 性能　出处：《铸造技术》2017年05期 　论文类型：期刊论文

【摘要】：采用机械球磨法制备了超细纳米晶AZ31合金,研究了球磨时间和包套温挤压温度对AZ31合金粉末形貌、颗粒尺寸、晶粒尺寸和力学性能的影响,并分析了球磨时间的作用机理。结果表明,机械球磨后的混合粉末的平均颗粒尺寸都要小于未经过机械球磨的原料粉末,且随着机械球磨时间的延长,粉末的平均颗粒尺寸减小;球磨80 h、250℃包套挤压后AZ31合金棒材中的晶粒大小分布较为均匀,平均晶粒尺寸约为200 nm;在相同的包套挤压温度下,随着机械球磨时间的延长,AZ31合金的显微硬度都有逐渐增加的趋势;在相同的机械球磨时间下,随着包套挤压温度的升高,AZ31合金的显微硬度逐渐降低。随着机械球磨时间的延长,AZ31合金的室温屈服强度有所增加,在机械球磨时间为80 h时取得最大值453 MPa。
[Abstract]:Ultrafine nanocrystalline AZ31 alloys were prepared by mechanical ball milling. The effects of milling time and temperature extrusion temperature on the powder morphology, particle size, grain size and mechanical properties of AZ31 alloy were studied. The mechanism of milling time is analyzed. The results show that the average particle size of the mixed powder is smaller than that of the raw powder without mechanical ball milling, and with the prolonging of the milling time, the average particle size of the mixed powder after mechanical ball milling is smaller than that of the raw material powder without mechanical ball milling. The average particle size of the powder decreases, and the grain size distribution in the AZ31 alloy bar is more uniform after 80 h or 250 鈩，

本文编号：1545857