全层TiAl基合金平板拉伸连续卸载试验
Repeatedly Load-unload-reload Tensile Tests of Fully Lamellar TiAl Alloys
摘 要
对TiAl基合金在经历多次拉伸卸载以后宏观性能和微裂纹面密度的变化进行了详细研究.结果表明：在载荷控制下的试验中,随着卸载应力的增加,裂纹面密度并没有增大,即在这种加载方式下材料损伤程度并不能用微裂纹面密度来衡量.在载荷控制连续加载-卸载过程中,弹性模量并没有降低,说明微裂纹损伤引起的体积效应在此过程中比较弱.当在较高应力下卸载时,断裂应力σf、断裂应变εf和单位面积断裂功Uf开始减小,这是因为微裂纹损伤引起的面积效应仅仅表现在断裂面上,所以在此过程中面积效应较为明显,导致断裂应力降低.
多次拉伸卸载
裂纹面密度
fully lamellar TiAl alloy
repeatedly load-unload
crack surface density
Abstract
A fully lamellar TiAl alloy was tested using load-controlled tensile unload procedure.The microcracks were measured for each specimen as it was subjected to various repeatedly load-unload-reload processes.The surface density of cracks do not increase with the increasing of unloading stress,indicating that the surface density of cracks is not regarded as damage parameter through statistical analysis.No appreciable effect of the volumetric effects of microcrack damage on the apparent elastic modulus could be found in the repeatedly load-unload-reload processes.Microcrack damage produced at relatively high preloading reduced the fracture stress (σf),fracture strain(εf) and fracture energy per unit (Uf).The facial effect of microcrack damage is appreciable:Microcrack damage produced by high preload on a weakest cross section reduce the fracture stress.
中图分类号 TG146
所属栏目
基金项目 国家自然科学基金资助项目(50471109)
收稿日期 2005/12/19
修改稿日期 2006/3/15
网络出版日期
作者单位点击查看
备注曹睿(1977-), 女,甘肃临洮人,讲师,博士.
引用该论文: CAO Rui,ZHU Hao,ZHANG Ji,CHEN Jian-hong. Repeatedly Load-unload-reload Tensile Tests of Fully Lamellar TiAl Alloys[J]. Materials for mechancial engineering, 2007, 31(1): 16～19
曹睿,朱浩,张继,陈剑虹. 全层TiAl基合金平板拉伸连续卸载试验[J]. 机械工程材料, 2007, 31(1): 16～19
被引情况:
【1】林有智,周少秋,曹睿,陈剑虹, "TiAl基合金的拉伸疲劳断裂机理",机械工程材料 37, 25-28(2013)
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】陈国良,林均品.有序金属间化合物结构材料物理金属学基础[M].北京:冶金工业出版社,1999.
【2】Toshimitsu T.Development of a TiAl turbocharger for passenger vehicle[J].Materials Sciences and Engineering,2002,A329-331:582-588.
【3】Kim Y W.Progress in the understanding of gamma titanium aluminides[J].JOM,1989,41(7):24-30.
【4】Chan K S,Kim Y M.Influence of microstructure on crack-tip micromechanicas and fracture behaviors of a two-phase TiAl alloy[J].Metallurgical trans A,1992,23A(10):1663-1677.
【5】曹睿,陈剑虹,张继,等.近全层组织g-TiAl基合金的室温拉伸断裂机理的研究[J].稀有金属材料与工程,2005,34(5):696-700.
【6】Lu Yonghao,Zhang Yong-gang.The fracture mechanism of a fully lamellar γ-TiAl alloy through in-situ SEM observation[J].Intermetallics,2000,12(8):1443-1445.
【7】朱浩,曹睿,姚海军,等.不同卸载应力对层状TiAl基合金损伤程度的影响[J].稀有金属,2006,30(3):313-317.
【2】Toshimitsu T.Development of a TiAl turbocharger for passenger vehicle[J].Materials Sciences and Engineering,2002,A329-331:582-588.
【3】Kim Y W.Progress in the understanding of gamma titanium aluminides[J].JOM,1989,41(7):24-30.
【4】Chan K S,Kim Y M.Influence of microstructure on crack-tip micromechanicas and fracture behaviors of a two-phase TiAl alloy[J].Metallurgical trans A,1992,23A(10):1663-1677.
【5】曹睿,陈剑虹,张继,等.近全层组织g-TiAl基合金的室温拉伸断裂机理的研究[J].稀有金属材料与工程,2005,34(5):696-700.
【6】Lu Yonghao,Zhang Yong-gang.The fracture mechanism of a fully lamellar γ-TiAl alloy through in-situ SEM observation[J].Intermetallics,2000,12(8):1443-1445.
【7】朱浩,曹睿,姚海军,等.不同卸载应力对层状TiAl基合金损伤程度的影响[J].稀有金属,2006,30(3):313-317.
相关信息
