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2397合金高周疲勞性能及裂紋萌生擴展行為
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中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室,中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室,中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室,中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室,中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室

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國家重點基礎(chǔ)研究發(fā)展計劃(“973”計劃)(2012CB619503);


High-cycle fatigue properties and crack initiation and propagation behavior of 2397 alloy
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School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University

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    摘要:

    研究2397-T87鋁鋰合金的高周疲勞性能及裂紋萌生擴展行為。結(jié)果表明：在應(yīng)力比R=0.1時，2397-T87鋁鋰合金L方向、LT方向和ST方向光滑試樣（Kt=1.0）的疲勞壽命極限分別約為192 MPa，243 MPa和151 MPa；缺口試樣（Kt=3.0）的疲勞壽命極限分別約為72 MPa，78MPa和70 MPa。其疲勞裂紋主要萌生于試樣表面，以及氧化物、夾雜等脫落形成的空洞，Al（CuFeMn）第二相雜質(zhì)粒子。駐留滑移帶（PSB）和晶粒取向?qū)ζ淦诹鸭y早期擴展有重要影響。

    Abstract:

    The high-cycle fatigue properties and crack initiation and propagation behavior of 2397-T87 Al-Li alloy were investigated. The results show that when the stress ratio R is 0.1, the fatigue limit of smooth specimens of 2397-T87 Al-Li alloy in the L orientation, LT orientation and ST orientation are about 192 MPa, 243 MPa and 151 MPa respectively. The fatigue limit of notch specimens in the L orientation, LT orientation and ST orientation are about 72 MPa, 78 MPa and 70 MPa respectively. Fatigue crack initiation of this alloy mainly occurred on the sample surface, with initiation from the defects caused by the oxides and inclusions, the Al(CuMnFe) secondary phases. Persistent slip bands (PSB) and grain orientation have important influence on fatigue crack propagation at early stage.

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范雪松,鄭子樵,張龍,胡芳,龔鑄.2397合金高周疲勞性能及裂紋萌生擴展行為[J].稀有金屬材料與工程,2017,46(5):1327~1333.[fan xue song, zheng zi qiao, zhang long, hu fang, gong zhu. High-cycle fatigue properties and crack initiation and propagation behavior of 2397 alloy[J]. Rare Metal Materials and Engineering,2017,46(5):1327~1333.]
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  • 收稿日期:2015-03-05
  • 最后修改日期:2015-04-13
  • 錄用日期:2015-06-11
  • 在線發(fā)布日期: 2017-09-27
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