深冷处理对铸态ZK60镁合金显微组织和力学性能的影响
Effect of Deep Cryogenic Treatment on Microstructure and Mechanical Properties of As-Cast ZK60 Magnesium Alloy
摘 要
选用工业化生产的半连铸ZK60镁合金为研究对象, 采用力学性能检测设备、光学显微镜、X射线衍射仪和透射电镜等研究了深冷处理(77 K)对其显微组织和力学性能的影响。结果表明: 深冷处理可以细化ZK60合金的显微组织, 引起一定程度的晶粒转动并促进微细第二相析出, 产生了细晶强化及第二相析出强化, 使ZK60合金的屈服强度由150.5 MPa提高到175.8 MPa, 显微硬度由65.91 HV提高到74.03 HV, 伸长率由17.5%提高到21.0%。
ZK60镁合金
力学性能
显微组织
deep cryogenic treatment (DCT)
ZK60 magnesium alloy
mechanical property
microstructure
Abstract
By taking a commercial production semi-continuous casting ZK60 magnesium alloy as the research objection, the effect of deep cryogenic treatment (DCT) at 77 K on the microstructure and mechanical properties was analyzed by means of mechanical property testing equipment, optical microsopy, X-ray diffraction and transmission electron microscopy. The results show that DCT could refine the microstructure, cause some grain orientation and improve the fine second phase precipitates, that resulted in fine grain strengthening and second phase precipitate strengthening. After cryogenic treatment yield strength of the ZK60 magnesium alloy reached from 1505 MPa to 175.8 MPa, the microhardness increased from 65.91 HV to 74.03 HV and the elongation increased from 17.5% to 21.0%.
中图分类号 TG166.4
所属栏目
基金项目 国家自然科学基金资助项目(50804015)
收稿日期 2009/12/14
修改稿日期 2010/11/26
网络出版日期
作者单位点击查看
备注陈鼎(1975-), 男, 湖南湘潭人, 教授, 博士。
引用该论文: CHEN Ding,JIANG Qiong,JIANG Yong,CHEN Zhen-hua. Effect of Deep Cryogenic Treatment on Microstructure and Mechanical Properties of As-Cast ZK60 Magnesium Alloy[J]. Materials for mechancial engineering, 2011, 35(2): 16～19
陈鼎,蒋琼,姜勇,陈振华. 深冷处理对铸态ZK60镁合金显微组织和力学性能的影响[J]. 机械工程材料, 2011, 35(2): 16～19
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参考文献
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【2】陈鼎, 黄培云, 黎文献.金属材料深冷处理发展概况[J].热加工工艺, 2001(4):57-59.
【3】CHEN Ding. Preferred grain orientation of aluminum and aluminum alloys after cryogenic treatment[J].Metal, 2008, 62(11):744-747.
【4】袁子洲, 张劲松, 陈秀娟, 等.Cu15Ni8SnNb合金带材的深冷处理强化及微细结构研究[J].机械工程材料, 2003, 27(7):28-34.
【5】ZHIRAFAR S. Effect of cryogenic treatment on the mechanical properties of steel and aluminium alloys[D].Montreal: Concordia University, 2005.
【6】SHEVTSOV M A. Some new tendencies in the development of electrical resistance furnace and production processes for heat and chemical heat treatment of metal abroad[J].Metal Science and Heat Treatment, 1987, 29(5/6):428-434.
【7】陈鼎, 夏树人, 姜勇.镁合金深冷处理研究[J].湖南大学学报:自然科学版, 2008, 35(1):62-65.
【8】BENSELY A, VENKATESH S, MOHAN L D. Effect of cryogenic treatment on distribution of residual stress in case carburized En 353 steel[J].Materials Science and Engineering A, 2008, 479: 229-235.
【9】JIANG Yong, CHEN Ding, CHEN Zhen-hua. Effect of cryogenic treatment on the microstructure and mechanical properties of AZ31 magnesium alloy[J].Materials and Manufacturing Processes, 2010, 25(8):837-841.
【10】麻彦龙, 潘复生, 左汝林.高强度变形镁合金的研究现状[J].重庆大学学报, 2004, 27(9):80-85.
【11】CHEN Hong-mei, KANG Suk-bong, YU Hua-shun, et al. Effect of heat treatment on microstructure and mechanical properties of twin roll cast and sequential warm rolled ZK60 alloy sheets[J].Alloys and Compounds, 2009, 476:324-328.
【12】陈鼎, 黎文献.深冷处理下铝和铝合金的晶粒转动[J].中南工业大学学报:自然科学版, 2000, 31(6):544-547.
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