Mg-4Al-2RE合金压缩蠕变本构方程的建立
Establishment of Compression Creep Constitutive Equations of Mg-4Al-2RE Alloy
摘 要
采用自制的蠕变试验装置研究了AE42(Mg-4Al-2RE)合金在温度为125~175 ℃(398~448 K)、压力为88~112 MPa范围内的压缩蠕变行为,并采用回归法建立了该合金的压缩蠕变本构方程.结果表明:随着温度升高和压力增大,AE42合金的压缩蠕变应变和稳态蠕变速率都呈明显的上升趋势;在175 ℃(398 K)、100~112 MPa条件下,合金进入加速蠕变阶段,出现蠕变断裂现象;AE42合金的压缩蠕变本构方程为s=8.19×10-7σ5.39exp(-90 410材料2015-05RT),蠕变机制为晶界扩散主导的位错攀移机制.
压缩蠕变
本构方程
晶界扩散
位错攀移
Mg-4Al-2RE alloy
compressive creep
constitutive equation
grain boundary diffusion
dislocation climb
Abstract
The compressive creep behavior of Mg-4Al-2RE(AE42) alloy was investigated by using self-made creep test apparatus at temperatures of 125-175 ℃(398-448 K) and compressive stresses of 88-112 MPa.In addition,the compression creep constitutive equation of the alloy was established by regression method.The results indicate that the compressive creep strain and steady state compressive creep rate is increased obviously with the increase of temperature and compressive stress.AE42 alloy enters the accelerated creep stage quickly and exhibites creep rupture character along grain boundaries under the conditions of 175 ℃(398 K) and 100-112 MPa.The compressive creep constitutive equation of AE42 alloy is written as s=8.19×10-7σ5.39exp(-90 410材料2015-05RT),the mechanism of dislocation climb determined by grain boundary diffusion is the main compressive creep mechanism.
中图分类号 TG146.2
所属栏目 物理模拟与数值模拟
基金项目 广西高校科研项目(YB2014432)
收稿日期 2014/10/11
修改稿日期 2015/3/18
网络出版日期
作者单位点击查看
备注徐道芬(1982-),女,四川隆昌人,讲师,博士.
引用该论文: XU Dao-fen. Establishment of Compression Creep Constitutive Equations of Mg-4Al-2RE Alloy[J]. Materials for mechancial engineering, 2015, 39(5): 85～88
徐道芬. Mg-4Al-2RE合金压缩蠕变本构方程的建立[J]. 机械工程材料, 2015, 39(5): 85～88
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参考文献
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【3】关绍康,王迎新.汽车用高温镁合金的研究进展[J].汽车工艺与材料,2003(4)3-8.
【4】陈振华.耐热镁合金[M].北京:化学工业出版社,2007:503-545.
【5】陈君,李全安,张清,等.Sm在耐热镁合金中的作用及研究进展[J].材料导报,2014,28(4):109-115.
【6】张小红,龙思远,吴星宇,等.钙含量对耐热镁铝稀土合金组织与性能的影响[J].机械工程材料,2013,37(5):51-53,58.
【7】BAI Jing,SUN Yang-shan,XUN Shan,et al.Microstructure and tensile creep behavior of Mg-4Al based magnesium alloys with alkaline-earth elements Sr and Ca additions[J].Materials Science and Engineering:A,2006,419:181-188.
【8】曾明,徐道芬,张尧成,等.Ca和Sr对AE41合金压蠕变行为的影响[J].铸造,2008,57(12):1280-1283.
【9】张尧成,曾明,廖春丽,等.钙和硅元素对AE41镁合金显微组织及压入蠕变性能的影响[J].机械工程材料,2009,33(11):50-53,57.
【10】刘子利,陈照峰,刘希琴,等.Sb合金化对AE41镁合金耐热性能的影响[J].材料研究学报,2006,20(2):186-190.
【11】王帅,王社斌,李晓斌,等.Sb对AE42镁合金中稀土元素的替代作用[J].太原理工大学学报,2009,40(1):56-59.
【12】徐道芬,叶东,黄健.Mg-Al-RE-Ca-Sr合金的压缩蠕变行为[J].铸造技术,2009,30(11):1452-1455.
【13】HUANG De-ming,CHEN Yun-gui,TANG Yong-bai,et al.Indentation creep behavior of AE42 and Ca-containing AE41 alloys[J].Materials Letters,2007,61:1015-1019.
【14】ZHU S M,GIBSON M A,NIE J F,et al.Microstructural analysis of the creep resistance of die-cast Mg-4Al-2RE alloy[J].Scripta Materialia,2008,58:477-480.
【15】RZYCHON T,KIELBUS A,CWAJNA J,et al.Microstructural stability and creep properties of die casting Mg-4Al-4RE magnesium alloy[J].Materials Characterization,2009,60:1107-1113.
【16】张尧成,曾明,郭平,等.AE42合金的抗压入蠕变性能[J].中国有色金属学报,2009,19(7):1169-1175.
【17】HUMBLE P.Towards a cheap resistant magnesium alloy[J].Material Forum,1997,21:45-56.
【18】SHI L,NORTHWOOD D O.Strain-harding and recovery during the creep of pure polycrystalline magnesium[J].Acta Metallurgica et Materialla,1994,42(3):871-877.
【19】REGEV M,AGHION E,ROSEN A.Creep studies of AZ91D pressure die casting[J].Materials Science and Engineering:A,1997,234/236:123-126.
【20】袁广银,吕宜振,曾小勤,等.添加微量Sb对Mg-9Al-0.8Zn合金蠕变抗力及微观组织的影响[J].金属学报,2001,37(1):23-28.
【21】AGNEW S R,LIU K C,KENIK E A,et al.Tensile and compressive creep behavior of die cast materials alloy AM60M[J].TMS Annual Meeting,2000,1:285-290.
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