Fracture Mechanism of Tensile Fatigue for TiAl Based Alloys
摘 要
对TiAl基合金试样进行了拉伸疲劳试验, 并进行了断口观察, 探讨了该合金的拉伸疲劳断裂的机理。结果表明: 该合金断口上有很明显的河流花纹走向和唯一的起裂源, 断口以沿层面为主, 穿层面只占少数; 裂纹源通常位于断口表面的角落处, 然后裂纹沿多个方向解理扩展至试样边缘, 最后发生脆性解理断裂; 其断裂机理是在疲劳拉伸载荷作用下, 在应力较高处沿层裂纹开始出现, 裂纹在应力循环作用下不断扩展, 直至疲劳裂纹的长度达到与疲劳外加力所匹配的临界裂纹长度(即满足Griffiths条件)时, 试样整体解理断裂。
Abstract
TiAl based alloys were tested in tensile fatigue experiment, and their facture morphology was observed to study the facture mechanism of tensile fatigue. The results show that there were orientations of river pattern and sole crack initiation origin on the fracture of the alloy. The fracture surface was composed of a lot of inter-lamellas which were dominant and little trans-lamellas. The crack initiation origin was located at the corner of fracture surface, and the cracks propagated along different orientations to the edges of the specimen, then the specimen fractured. The fracture mechanism is described as following: several interlamellar cracks successively initiate under tensile fatigue loading at a highly stressed site, then the fatigue crack extends continuously by the cycling of fatigue stress. When the length of fatigue crack reaches the critical crack length matching to the loading stress, which means the Griffiths condition, the cleavage fracture of specimen will take place.
中图分类号 TG146
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(50471109); 宁德市科学技术计划项目(20100012)
收稿日期 2012/7/18
修改稿日期 2013/4/11
网络出版日期
作者单位点击查看
备注林有智(1981-), 男, 福建福州人, 讲师, 硕士。
引用该论文: LIN You-zhi,ZHOU Shao-qiu,CAO Rui,CHEN Jian-hong. Fracture Mechanism of Tensile Fatigue for TiAl Based Alloys[J]. Materials for mechancial engineering, 2013, 37(10): 25~28
林有智,周少秋,曹睿,陈剑虹. TiAl基合金的拉伸疲劳断裂机理[J]. 机械工程材料, 2013, 37(10): 25~28
被引情况:
【1】叶喜葱,吴彬彬,罗爱娇,赵光伟, "金属型底浇式真空吸铸钛铝基合金凝固的有限元模拟",机械工程材料 40, 49-53(2016)
【2】何素敬,黄雪梅,张磊安, "不同玻璃纤维单向增强树脂基复合材料的疲劳行为",机械工程材料 40, 65-68(2016)
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参考文献
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【2】曹睿, 陈剑虹, 张继, 等.γ-TiAl基合金的室温拉伸性能与断裂韧度的关系[J].机械工程材料, 2005, 29(3): 18-21.
【3】曹睿, 李雷, 张继, 等.TiAl金属间化合物基合金压缩断裂行为[J].机械工程学报, 2011, 47(6): 39-44.
【4】TRAIL S J, BOWEN P. Effect of stress concentrations on the fatigue life of a gamma-based TiAl[J].Materials Science and Engineering: A, 1995, 192/193: 427-434.
【5】GLOANEC A L, HENAFF G, BETHEACE D, et al. Fatigue crack growth behavior of a gamma-titanium-aluminide alloy prepared by casting and powder metallurgy[J].Scripta Materials, 2003, 49: 825-830.
【6】HENAFF G, GLOANEC A L. Fatigue properties of TiAl alloys[J].Intermetallics, 2005, 13: 543-558.
【7】曹睿, 林有智, 陈剑虹, 等.全层状TiAl基合金拉伸试验断裂过程及机理[J].机械工程学报, 2008, 44(1): 40-45.
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