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高鈮TiAl合金雙態(tài)組織室溫?cái)嗔研袨檠芯?/div>
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新世紀(jì)優(yōu)秀人才支持計(jì)劃 (NCET-04-0101)；高等學(xué)校科技創(chuàng)新工程重大項(xiàng)目培育資金(704008)


Study on Fracture Behaviour of the Duplex High-Nb-Containing TiAl Alloy at Room Temperature
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    摘要:

    通過(guò)對(duì)高鈮TiAl合金雙態(tài)組織的缺口試樣進(jìn)行原位拉伸、相應(yīng)的斷裂表面SEM觀察，研究其拉伸斷裂機(jī)制和裂紋擴(kuò)展的動(dòng)態(tài)過(guò)程。結(jié)果表明，高鈮TiAl合金雙態(tài)組織的斷裂模式主要是穿晶解理斷裂；合金的斷裂過(guò)程是主裂紋首先起裂，微裂紋的產(chǎn)生、擴(kuò)展和連接主裂紋，直至斷裂；在裂紋擴(kuò)展過(guò)程中，尖端附近區(qū)域范圍內(nèi)的γ相晶粒內(nèi)易形成微裂紋，為其斷裂過(guò)程的一個(gè)明顯特征；對(duì)于雙態(tài)缺口試樣，由于晶粒細(xì)小, 缺口根部出現(xiàn)應(yīng)力集中，裂紋擴(kuò)展路徑比較平直

    Abstract:

    By means of in-situ tension test on notched specimens of the duplex high-Nb-containing TiAl alloy and the corresponding SEM observation, the tensile fracture mechanism and crack propagation dynamic process were investigated. The results indicate that the fracture was dominated by transgranular cleavage. The fracture process was that the main crack occurred firstly, microcrack appeared and then propagated, the main crack and microcrack were linked, and the alloy fractured finally. In the crack propagation process, the obvious fracture characteristic was easy formation of microcracks in γ grains near the crack tip. For notched specimens of duplex microstructure, the stress concentrated at the notch root, and the main crack propagation path was straighter because the grain size was very fine

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閆 茹,許正芳,林均品,王艷麗,葉 豐,林 志,陳國(guó)良.高鈮TiAl合金雙態(tài)組織室溫?cái)嗔研袨檠芯縖J].稀有金屬材料與工程,2010,39(6):1041~1044.[Yan Ru, Xu Zhengfang, Lin Junpin, Wang Yanli, Ye Feng, Lin Zhi, Chen Guoliang. Study on Fracture Behaviour of the Duplex High-Nb-Containing TiAl Alloy at Room Temperature[J]. Rare Metal Materials and Engineering,2010,39(6):1041~1044.]
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  • 收稿日期:2009-06-05
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