| 铝硅钛合金疲劳裂纹扩展行为研究 |
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| 引用本文： | 王明星,刘志勇,翁永刚,宋天福,霍裕平,谢敬佩. 铝硅钛合金疲劳裂纹扩展行为研究[J]. 机械工程材料, 2003, 27(1): 47-50 |
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| 作者姓名： | 王明星 刘志勇 翁永刚 宋天福 霍裕平 谢敬佩 |
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| 作者单位： | 1. 郑州大学物理工程学院,河南,郑州,450052
2. 洛阳工学院机械工程系,河南,洛阳,471039 |
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| 基金项目： | 河南省科技攻关资助项目 (0 0 40 42 60 0 ) |
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| 摘 要： | 以电解铝硅钛中间合金为主要原料，熔炼与ZL101A合金成分基本相同的合金AST101，对比研究了AST101和ZL101A合金的疲劳裂纹扩展行为。在应力比R=0.1和0.5的试验条件下，AST101合金的抗疲劳裂纹扩展能力不如ZL101合金。金相分析表明，AST101合金的铁含量较高，在合金中形成了脆性针状富铁相，该相自身的断裂和与基体的脱粘促进了合金疲劳裂纹的扩展，此外，AST101合金的微观组织特性影响了疲劳裂纹的闭合程度，也降低了合金的抗疲劳裂纹扩展能力。
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| 关 键 词： | 铝硅钛合金 富铁相 疲劳裂纹扩展 |
| 文章编号： | 1000-3738(2003)01-0047-04 |
| 修稿时间： | 2001-11-06 |
Fatigue Crack Growth of Electrolytic Aluminum-silicon-titanium Alloy |
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| WANG Ming xing ,LIU Zhi yong ,WENG Yong gang ,SONG Tian fu ,HUO Yu ping ,XIE Jing pei. Fatigue Crack Growth of Electrolytic Aluminum-silicon-titanium Alloy[J]. Materials For Mechanical Engineering, 2003, 27(1): 47-50 |
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| Authors: | WANG Ming xing LIU Zhi yong WENG Yong gang SONG Tian fu HUO Yu ping XIE Jing pei |
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| Affiliation: | WANG Ming xing 1,LIU Zhi yong 1,WENG Yong gang 1,SONG Tian fu 1,HUO Yu ping 1,XIE Jing pei 2 |
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| Abstract: | AST101 alloy used in the present investigation was melt with electrolytic aluminum silicon titanium master alloy. The chemical composition of the alloy is basically the same as that of ZL101A alloy. The fatigue crack growth property of AST101 alloy was investigated and compared with that of ZL101A alloy. In the test conditions of stress ratio R =0.1 and 0.5, the fatigue crack growth resistance of AST101 alloy is not as good as that of ZL101A alloy. Metallographic observation shows that there are many brittle needle like iron rich phases in AST101 alloy due to its higher Fe content. Cracking and decohesion from Al matrix of the brittle phases accelerate fatigue crack propagation. The microstructure characteristic affects the level of fatigue crack closure of AST101 alloy and also decreases the fatigue crack growth resistance of the alloy. |
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| Keywords: | aluminum alloy iron rich phase fatigue crack growth |
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