2A12铝合金T6和T8时效态的疲劳性能Fatigue property of 2A12 aluminum alloy for T6 and T8 aging
夏卿坤,刘志义,王恒,刘煜,许晓嫦
摘要(Abstract):
在MTS-8032疲劳试验机上对不同时效状态的2A12铝合金进行轴向拉伸应力疲劳试验,并采用扫描电镜(SEM)分析该合金T6和T8时效状态对疲劳断口形貌的影响。结果表明:T6态(495℃×1 h水淬,190℃×8 h时效)和T8态(495℃×1 h水淬,预拉伸4%后进行190℃×6 h时效)2A12合金棒材,轴向疲劳寿命都随着应力水平的提高而降低。在较高应力水平如420 MPa,T6态和T8态合金的轴向疲劳寿命相近,都在105左右。而在较低应力水平如280 MPa,T8态合金的疲劳断裂循环周次较高。预变形处理提高合金300 MPa应力水平以下的疲劳寿命。T6态合金在107次的疲劳强度约为220 MPa,而T8态合金在107次的疲劳强度约为280 MPa。4%的预拉伸变形处理可以提高合金的疲劳强度。
关键词(KeyWords): 2A12合金;时效;疲劳性能;断口
基金项目(Foundation): 国家自然科学基金(51171209);; 湖南省重点学科建设项目;; 湖南科技计划项目(2013FJ3059);; 长沙市科技计划项目(K1205050-11)
作者(Author): 夏卿坤,刘志义,王恒,刘煜,许晓嫦
DOI: 10.13289/j.issn.1009-6264.2014.04.013
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