Effect of Phosphate-Buffered Solution Corrosion on the Ratcheting Fatigue Behavior of a Duplex Mg-Li-Al Alloy
Effect of Phosphate-Buffered Solution Corrosion on the Ratcheting Fatigue Behavior of a Duplex Mg-Li-Al Alloy
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DOI：
10.1007/s11665-016-2039-y
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发表时间：
2016-04
影响因子：
2.3
通讯作者：
Xini Yuan;Dunji Yu;Li-Lan Gao;Hong Gao
中科院分区：
文献类型：
--
作者：
Xini Yuan;Dunji Yu;Li-Lan Gao;Hong Gao
本文研究了双相Mg-Li-Al合金在磷酸盐缓冲溶液中的单轴棘轮行为和疲劳行为。显微组织观察揭示点蚀和细丝腐蚀缺陷，这损害了合金的承载能力，并导致应力集中，从而导致棘轮应变的加速积累和在相同的标称载荷条件下的疲劳寿命缩短。通过比较Smith模型、Smith-Watson-Topper模型和Paul-Sivaprasad-达尔模型，提出了基于Broberg损伤准则和Paul-Sivaprasad-达尔模型的棘轮疲劳寿命预测模型，并对所研究的镁合金进行了上级预测。
This work reports the uniaxial ratcheting and fatigue behavior of a duplex Mg-Li-Al alloy under the influence of phosphate-buffered solution corrosion. Microstructural observations reveal pitting and filament corrosion defects, which impair the load-bearing capacity of the alloy and cause stress concentration, thus leading to an accelerated accumulation of ratcheting strain and shortened fatigue life under the same nominal loading conditions. Comparing Smith model, Smith-Watson-Topper model, and Paul-Sivaprasad-Dhar model, a ratcheting fatigue life prediction model based on the Broberg damage rule and the Paul-Sivaprasad-Dhar model was proposed, and the model yielded a superior prediction for the studied magnesium alloy.