黄志权,韦建春,黄庆学,马立峰,高翔宇,岳照涵.轧前深冷处理对AZ31镁合金显微组织和力学性能的影响[J].稀有金属材料与工程,2018,47(10):2942~2948.[Huang Zhiquan,Wei Jianchun,Huang Qingxue,Ma Lifeng,Gao Xiangyu,Yue Zhaohan.Effect of cryogenic treatment prior rolling on microstructure and mechanical properties of AZ31 magnesium alloy[J].Rare Metal Materials and Engineering,2018,47(10):2942~2948.]
轧前深冷处理对AZ31镁合金显微组织和力学性能的影响
投稿时间:2017-03-19  修订日期:2017-07-10
中文关键词:  AZ31镁合金  深冷处理  第二相析出  断口形貌
基金项目:国家自然科学基金青年项目(51604181),山西煤基低碳联合基金(U1510131),山西省重点研发计划(201603D121010),山西省应用基础研究计划(201601D021095),山西省高等学校科技创新项目(2015172)
中文摘要:
      本文通过对铸态AZ31镁合金经不同条件的深冷处理继而热轧,分析其强度、韧性、延展性效应及其规律。深冷实验条件分别为-60℃/12h、-120℃/12h、-180℃/12h、-60℃/2h和-180℃/2h。结果表明:AZ31经适宜的深冷处理,晶粒得到细化,强度、韧性及延展性得到有效提高;与未经深冷处理试样相比,深冷处理时间为2h的两种试样中都出现大量孪晶;经-60℃/12h深冷处理后再进行轧制试样的显微组织最为细小均匀,屈服强度提高了25.8%,而延伸率则更是提高了4倍,由3.06%提高到了12.31%;深冷处理后的AZ31镁合金断口呈现出脆性断裂和塑性断裂集合的复合性断裂特征。
Effect of cryogenic treatment prior rolling on microstructure and mechanical properties of AZ31 magnesium alloy
英文关键词:AZ31 magnesium alloy  cryogenic treatment  second phase particles  fracture morphology
英文摘要:
      The effects of cryogenic treatment prior hot rolling on the strength toughness and ductility of as-cast AZ31 magnesium alloy plate was investigated in this study. The cryogenic treatment conditions were ?60 °C/12 h, ?120 °C/12 h, ?180 °C/12 h, ?60 °C/2 h, and ?180 °C/2 h. Experimental results indicated that appropriate cryogenic treatment conditions can significantly refine the grain size and the strength, toughness and ductility were also improved. A large number of twins appeared in both kinds of samples cryogenically treated for 2 h. The grain size of the sample, which experienced cryogenic treatment for 12 h at ?60 °C followed by rolling process was the finest and most uniform. By increasing cryogenic treatment duration to 12 h, the yield strength of the AZ31 magnesium alloy was enhanced by 25.8% after rolling under ?60 °C cryogenic treatment temperature. Meanwhile, a four-time increase in extension rate (3.06% to 12.31%) was attained. The tensile fracture presented a mixed-mode fracture, which is characteristic of brittle and ductile fracture mechanisms.
作者单位E-mail
黄志权 太原科技大学重型机械教育部工程研究中心 hzq3991@163.com 
韦建春 Guangxi Liuzhou Iron and Steel Group Company Limited,Liuzhou  
黄庆学 太原科技大学重型机械教育部工程研究中心 hqx4350@163.com 
马立峰 太原科技大学重型机械教育部工程研究中心  
高翔宇 太原科技大学重型机械教育部工程研究中心  
岳照涵 太原科技大学重型机械教育部工程研究中心  
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