本文研究了高温下呈现脆性的多晶Ｎｉ_３Ａｌ（０．６ａｔ，－％Ｂ）合金的高温疲劳性能。载荷控制的拉－拉疲劳实验在４５０℃及空气条件下完成。通过固定所有实验中最大拉伸应力值，而改变不同实验中最小拉伸应力值的方法，可区分循环应力幅或平均应力及其交互作用对材料损伤的影响。本实验获得的循环应力幅及平均应力与循环寿命的关系曲线呈现“Ｓ”形。本文初步分析了上述实验现象。
High temperature fatigue properties of a polycrystalline Ni_3Al(0.6at.-%B) alloy, being brittle at an elevated temperature, were studied. The tension-tension fatigue tests under controlled loading were carried out in air at 450 ℃. By fixing the maximum values of tensile stress in all tests but changing the minimum values of tensile stress in various tests, the effect of cyclic stress amplitude or mean stress and their interaction on the damage of materials may be differentiated. The results of cyclic stress amplitude and mean stress vs fatigue life are plotted as"S" shape and interpreted preliminarily.Correspondent: LI Gang, Institule of Metal Research, (Chinese Academy of Sciences, Shenyang 110015)
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| [6] | 青木清,和泉修,日本金属学会志1979 |
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