哈尔滨工程大学学报2017，Vol.38Issue(10)：1635-1641,7.DOI:10.11990/jheu.201606033
不同循环加载条件下镁合金AZ21腐蚀疲劳行为
Corrosion fatigue properties of AZ21 Mg alloy under different cyclic loading conditions
摘要
Abstract
Magnesium ( Mg) alloy is widely used for engineering structural components , and it normally bears com-plicated multiaxial loads .Multiaxial fatigue failure is the main failure mode of Mg alloy .To clarify the corrosion fa-tigue behavior of Mg alloy under complex loads , the paper studies the multiaxial cyclic fatigue behavior of Mg alloy AZ21 in a phosphate-buffered solution ( PBS) .The dominant deformation mechanisms were revealed under the cou-pling effect of different loading paths and corrosive environments by analyzing the evolution law of the stress and strain hysteresis and peak strain of Mg alloy AZ 21.Results of the fatigue test conducted in the corrosive environ-ment show that , under the same and equivalent stress amplitude , the life of Mg alloy AZ21 in PBS corrosive envi-ronment and at the non-proportional loading path is apparently lower than that under the conditions of uniaxial ten -sion and purely torsional path .Basquin formula was used to predict the fatigue life of the Mg alloy AZ 21 under the coupling effect of complex loads and PBS corrosive environment .Through the introduction of a non-proportionality path factor into Basquin formula for amendment , the fatigue life of Mg alloy AZ 21 in PBS corrosive environment can be reasonably forecast under the same loads , circular path , and rhombus path .关键词
镁合金/多轴疲劳失效/腐蚀疲劳/多轴棘轮/非比例加载/寿命预测/复杂载荷/磷酸盐缓冲溶液Key words
magnesium alloy/multiaxial fatigue failure/corrosion fatigue/multi-axial ratcheting/non-proportional loading/lifetime prediction/complex loads/phosphate buffered solution分类
交通工程引用本文复制引用
龙飞,程维姝,陈刚,崔云..不同循环加载条件下镁合金AZ21腐蚀疲劳行为[J].哈尔滨工程大学学报,2017,38(10):1635-1641,7.基金项目
国家自然科学基金项目(11172202) （11172202）
教育部新世纪优秀人才项目(NCET-13-0400). （NCET-13-0400）
