Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第7期    总第220期    2017年7月

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文章编号:1004-0609(2017)-07-1337-07
AA2024-H18铝合金同步冷却热成形后的强化机制
陈国亮1, 2,陈明和1,王 宁1,孙佳伟1

(1. 南京航空航天大学 机电学院,南京 210016;
2. 常州机电职业技术学院 模具技术系,常州 213164
)

摘 要: 为了研究同步冷却热成形工艺对可热处理铝合金的显微组织演变规律以及强化机制的影响,选用H18态AA2024铝合金板料进行同步冷却热成形及自然时效试验,并进行力学性能测试、光学显微组织观察及TEM分析。结果表明:同步冷却热成形工艺对AA2024铝合金的显微组织影响明显;H18态AA2024铝合金板料经过同步冷却热成形及96 h自然时效后,试样变形区的位错密度增加,并出现细针状的Al2CuMg(S′)相,使得变形区的屈服强度及抗拉强度分别较冷冲压工艺试样提高4%、12%;此时,AA2024铝合金的强化机制主要是弥散相Al20Cu2Mn3(T相)和沉淀相Al2CuMg(S′相)对位错的钉扎作用,以及位错间的相互作用。

 

关键字: 同步冷却热成形;AA2024铝合金;显微组织;强化机制;力学性能

Strengthening mechanism of hot forming with synchronous cooling of AA2024-H18 aluminum alloy
CHEN Guo-liang1, 2, CHEN Ming-he1, WANG Ning1, SUN Jia-wei1

1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2. Department of Mould Technology, Changzhou Institute of Mechatronic Technology, Changzhou 213164, China

Abstract:Hot forming test with synchronous cooling, metallographic and TEM observation and tensile test were performed to investigate the influence of hot forming with synchronous cooling operations on the microstructure evolution and strengthening mechanism of AA2024-H18 aluminum alloy. The results show that, the yield strength of hot formed AA2024 sheet with 96 h natural aging is 4%, which is superior to that of traditionally formed sheet, and meanwhile, the tensile strength is increased by 12%. Based on the microstructure observation and analysis, the strengthening is generated by the increase of the dislocation density and precipitation of some fine acicular particles in form of Al2CuMg (S′). The main strengthening mechanism of AA2024 aluminum alloy underwent hot forming with synchronous cooling is the pinning effect of dispersoid phase Al20Cu2Mn3 (T) and precipitated phase Al2CuMg (S′) on dislocation as well as the interaction of dislocation.

 

Key words: hot forming with synchronous cooling; AA2024 aluminum alloy; microstructure; strengthening mechanism; mechanical behavior

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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