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時效制度對Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr合金斷裂行為的影響
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“973”項目(2005CB623705)；國家自然科學基金(50875031)


Influence of Aging Treatment Regime on Fracture Behavior of Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr Alloy
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    摘要:

    通過拉伸性能測試及金相顯微鏡、掃描電鏡和透射電鏡分析對比研究了Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr合金在T6與T74熱處理狀態(tài)下的力學性能、斷裂行為和顯微組織。結果表明：相對T6態(tài)，Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr合金經(jīng)T74處理后，強度降低了約15%，但延伸率和電導率分別增加了52%和29%。合金T6態(tài)的斷裂方式為穿晶剪切和沿晶韌窩混合型斷裂；經(jīng)過T74處理的合金斷裂方式為穿晶韌窩型斷裂。不同熱處理狀態(tài)下，晶內和晶界組織對位錯運動的共同作用是決定合金斷裂行為的主要原因

    Abstract:

    Tensile properties, fracture behavior and microstructure of Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr alloy with T6 and T74 aging treatments were investigated by tensile testing, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that, compared with the values in T6 state, the strength of the alloy in T74 state decreases by 15%; however, the elongation and electrical conductivity of the alloy in T74 state increases by 52% and 29%, respectively. The fracture mode of the alloy in T6 state is transgranular shearing and intergranular dimple mixed fracture. In T74 state, the fracture mode of alloy is transgranular dimple fracture. The fracture behavior of the alloy with different aging treatments is mainly determined by the coordinating interaction between movement of the dislocation and microstructures in the grain and grain boundary

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王少華,張興國,楊守杰,房燦峰,郝 海,戴圣龍.時效制度對Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr合金斷裂行為的影響[J].稀有金屬材料與工程,2011,40(3):453~456.[Wang Shaohua, Zhang Xingguo, Yang Shoujie, Fang Canfeng, Hao Hai, Dai Shenglong. Influence of Aging Treatment Regime on Fracture Behavior of Al-7.1Zn-1.1Mg-1.6Cu-0.14Zr Alloy[J]. Rare Metal Materials and Engineering,2011,40(3):453~456.]
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  • 收稿日期:2010-03-25
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