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Plastic Asymmetry and Anomaly of Iron Aluminides - An Internal Variable Approach

机译：铝化物铁的塑性不对称和异常-内部变量方法

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Tension-compression asymmetry in the high temperature flow and anomalous yield behavior of Fe-28 at.%Al-5 at.%Cr alloy has been investigated. Flow curves were obtained from a series of tensile and compressive load relaxation tests. Constitutive relations at each deformation conditions were formulated using the recently proposed internal variable theory based on dislocation dynamics. In this study, high temperature flow stress of selected material was described as the sum of the internal and frictional stress. The anomaly and peak temperature of yield strength seem to be controlled by the anomaly of internal stress and the relative portion of internal and frictional stress in total flow stress, respectively. Asymmetric flow stress was observed in analogy with yield strength. In terms of constitutive parameters, critical stress for frictional flow (Σ_0) exhibited considerably higher value in compression, which physically postulates increased critical resolved shear stress (CRSS). Considering the crystallography and microstructure, it is presumably due to the 'extrinsic' effect of non-deviatoric stress tensor, as proposed in other studies.
机译：研究了Fe-28 at％Al-5 at％Cr合金在高温流动中的拉伸压缩不对称和屈服行为的异常。流量曲线是通过一系列拉伸和压缩载荷松弛测试获得的。使用最近提出的基于位错动力学的内部变量理论，在每个变形条件下建立了本构关系。在这项研究中，所选材料的高温流动应力被描述为内应力和摩擦应力之和。屈服强度的异常和峰值温度似乎分别由内部应力的异常和总流动应力中内部应力和摩擦应力的相对部分控制。与屈服强度类似地观察到不对称的流动应力。就本构参数而言，摩擦流的临界应力（Σ_0）在压缩中表现出较高的值，从物理上讲，临界解析剪切应力（CRSS）有所增加。考虑到晶体学和微观结构，这可能是由于非偏应力张量的“外在”效应所致，正如其他研究中所提出的那样。

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