Transactions of Materials and Heat Treatment

Title：Effect of chemical composition and microstructure on KIC of high strength aluminum alloy forging

Authors： PENG Fu-hua XUE Feng-mei LI Fu-guo LI Jiang GU Wei

Unit： Chengdu Aircraft Industry (Group) Limited Company Northwestern Polytechnical University

KeyWords： 7050 aluminum alloy forging fracture toughness micro-area analysis

ClassificationCode：TG146.21

year,vol(issue):pagenumber：2010,35(5):121-126

Abstract：

The effect laws of internal and external factors on fracture toughness (K_IC) of high strength aluminum alloy localization forging were discussed through the chemical composition and microstructure analysis of localization forging, based on the research application status of high strength aluminum alloy free forging. The fracture toughness indexes were evaluated comprehensively from the analysis of major effect factors on K_IC of localization 7050 forging, which were material and smelting factors, and combined with microstructure factors and micro\|area analysis. The reasonable approach to improve the fracture toughness indexes of high strength aluminum alloy localization forging is to strictly control the production of raw material, scientifically design the technology of forging and heat treatment, and regulate the strength and plasticity index of high strength aluminum alloy to make them collocate reasonably. The result shows that for localization forging, it should maintain the content of copper, add the content of magnesium and zinc, and strictly control the content, size and distribution of inclusions.

Funds：

航空基础科学基金资助项目（03H53048）

Reference：

［1］潘志军，黎文献．高强铝合金断裂韧性的研究现状及展望[J]．材料导报，2002，16（7）：14-17.
［2］Heinz A, Haszler A,Keidel C, et al. Recent development in aluminum alloys for aerospace applications[J]. Material Science Engineering A, 2000, 280(1): 102-107.
［3］Michael R Hill,Tina L Panontin. Micromechanical modeling of fracture initiation in 7050 aluminum[J].Engineering Fracture Mechanics, 2002, 69(18): 2163-2186.
［4］苏库德良绍夫，苏斯莫连采夫．铝合金断裂韧性[M]．高云震，译.北京：冶金工业出版社，1980.
［5］Dumont D,Deschamps A,Brechet Y. On the relationship between microstructure, strength and toughness in AA7050 aluminum alloy[J]. Materials Science and Engineering A, 2003, 356(12): 326-336.
［6］Hiroyuki Toda, Toshiro Kobayashi, Akihiro Takahashi. Mechanical analysis of toughness degradation due to premature fracture of course inclusions in wrought aluminium alloys [J]. Materials Science and Engineering A, 2000, 280(1): 69-75.
［7］Rabinovich M Kh. 细晶粒组织和超塑性变形对铝合金强度的影响[J]．有色金属加工，1996，(6)：47-58 .
［8］Jian Haigen, Jiang Feng, Wen Kang, et al. Fatigue fracture of high-strength Al-Zn-Mg-Cu alloy[J]. Transactions of Nonferrous Metals Society of China, 2009, 19(5): 1031-1036 .
［9］樊喜刚，蒋大鸣，单长智，等．Cu含量对Al-Zn-Mg-Cu合金的组织性能和断裂行为的影响[J]．轻合金加工技术，2006,34（2）：31-35.
［10］刘世兴，田世兴，陈昌麒．7050铝合金锻件的力学性能和断裂机制研究[J]．材料工程，1996，(4)：34-37.
［11］Fanyou Xie, Xinyan Yan, Ling Ding, et al. A study of microstructure and microsegregation of aluminum 7050 alloy [J]. Materials Science and Engineering A, 2003, 355(12): 144-153.
［12］许东．铝合金形变热处理工艺参数及其控制[J]．热处理技术与装备，2007，28（2）：44-46.
［13］钟皓，韩逸，陈琦，等．7150铝合金铸态组织中第二相的形貌及相组成[J]．特种铸造及有色合金，2008，28（2）：106-108.
［14］刘静，杨合，詹梅，等．铝合金管力学性能的拉伸试验研究[J]．锻压技术，2010，35（2）：113-116.

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