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2197(Al-Li)-T851合金的疲勞裂紋萌生與擴展行為研究
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國家重點基礎研究發(fā)展規(guī)劃 (“973”計劃) (2005CB623705)


Initiation and Propagation Behavior of Fatigue Cracks in 2197(Al-Li)-T851 Alloy
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    摘要:

    研究了2197-T851合金的疲勞裂紋萌生與擴展特性。結(jié)果表明，2197鋁鋰合金的疲勞裂紋萌生與應力水平有關，在較低應力下，主要萌生在第二相粒子、第二相粒子/基體界面以及表面缺陷處，而在較高應力水平下，還出現(xiàn)沿滑移帶和晶界處萌生。裂紋的擴展優(yōu)先沿有利滑移面，在晶粒間的擴展以沿{111}面的穿晶擴展為主，也有沿小角度晶界擴展的情況，合金具有很好的平面滑移性。裂紋在晶粒內(nèi)的擴展并非沿一個滑移系的直線擴展而是頻繁發(fā)生偏折，卻始終沿{111}面，可剪切共格相δ'粒子造成晶內(nèi)擴展路徑曲折

    Abstract:

    The initiation and propagation characteristics of the fatigue cracks were studied for 2197-T851 alloy. The results indicate that fatigue crack initiation is related to stress. Under smaller stress, fatigue cracks mainly initiate from the second phase particles and the interface between the second phase particles and matrix as well as from the surface defect. While with larger stress, fatigue cracks easily initiate from the grain boundary and the slip band. Fatigue cracks grow along the favorable slip plane with priority. When the favorable slip planes in the adjacent grains have an angle, the crack deflects. The coherent δ′ particles that can be sheared by dislocation result in the crack path meandering in the grain. The cracks grow mainly in transgranular mode along the (111) plane, and also along the small-angle grain boundaries.

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陳圓圓,鄭子樵,蔡 彪,徐建秋,佘玲娟,李 海.2197(Al-Li)-T851合金的疲勞裂紋萌生與擴展行為研究[J].稀有金屬材料與工程,2011,40(11):1926~1930.[Chen Yuanyuan, Zheng Ziqiao, Cai Biao, Xu Jianqiu, She Lingjuan, Li Hai. Initiation and Propagation Behavior of Fatigue Cracks in 2197(Al-Li)-T851 Alloy[J]. Rare Metal Materials and Engineering,2011,40(11):1926~1930.]
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  • 收稿日期:2010-11-26
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