Effects of trace Zr on the microstructure and properties of 2E12 alloy

Abstract：Al-4.0Cu-1.4Mg-0.6Mn (2E12) and Al-4.0Cu-1.4Mg-0.6Mn-0.3Zr aluminum billets were manufactured by soft-contact electromagnetic continuous casting (EMC). Subsequent forging and heat treatment were conducted and the effects of Zr on the microstructure and properties of the Al-4.0Cu-1.4Mg-0.6Mn alloy were studied. The results show that the addition of 0.3% Zr can reduce the dendrite and refine grains. During forging and solution treatment, fine and dispersive Al3Zr particles precipitated from the supersaturated α (A1) solid solution in the heating process of the billet can effectively pin dislocations and subgrain boundaries. Because of the addition of Zr, the mechanical properties are improved with the tensile strength, yield strength, elongation, and contraction of the area increasing by 5.4%, 11.3%, 9.7%, and 12.6%, respectively. Moreover, under the condition of R = 0.1, the fatigue crack growth rate (da/dN) of the Al-4.0Cu-1.4Mg-0.6Mn-0.3Zr alloy is lower than that of the Al-4.0Cu-1.4Mg-0.6Mn alloy. 作者： Author： WANG Jianzhao[1]  FANG Canfeng[1]  HAO Hai[1]  WANG Shaohua[1]  YANG Shoujie[2]  DAI Shenglong[2]  ZHANG Xingguo[1] 作者單位： School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, ChinaBeijing Institute of Aeronautical Materials, Beijing 100095, China 期 刊： 稀有金屬（英文版）   EISCI Journal： RARE METALS 年，卷(期)： 2009, 28(5) 分類號： Keywords： aluminum alloy    heat treatment    microstructure    mechanical properties    fatigue crack growth rate    機標分類號： V2 TF7 機標關鍵詞： microstructure and properties    fatigue crack growth rate    mechanical properties    solution treatment    continuous casting    tensile strength    addition    heating process    heat treatment    improved    results    During    yield    area    pin    EMC 基金項目： Effects of trace Zr on the microstructure and properties of 2E12 alloy[期刊論文]  稀有金屬（英文版） --2009, 28(5)Al-4.0Cu-1.4Mg-0.6Mn (2E12) and Al-4.0Cu-1.4Mg-0.6Mn-0.3Zr aluminum billets were manufactured by soft-contact electromagnetic continuous casting (EMC). Subsequent forging and heat treatment were conduc...

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