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Superplasticity-like behavior of Al-Al_3Ni eutectic alloy

机译：Al-Al_3Ni共晶合金的超塑性行为

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摘要

A directionally solidified Al-Al_3Ni eutectic alloy was extruded to obtain a micron-size subgrain structure with [111] close to the extrusion direction. Tensile tests of various initial strain rates were performed at 500℃ with the tensile axis parallel to the extrusion direction. The results show that the elongation is concave downward strain rate dependent in which the elongation vs. strain rate curve shifts to a higher strain rate and higher elongation regime when the Al_3Ni particles are residing only intergranularly. In this situation, the test material exhibits superplasticity-like behavior with a maximum elongation about 300% at the initial strain rate of 6.3 x 10~(-3) s~(-1), the flow curve behaves almost ideal plastically after initial hardening, the strain rate sensitivity is about 0.26, and the subgrain structure with [111] fiber texture is still retained. If intragranular Al_3Ni particles are also present, pinning of dislocations by these particles leads to a large initial work hardening rate, high work hardening, early onset of necking and inferior ductility.
机译：挤压定向凝固的Al-Al_3Ni共晶合金以获得[111]接近挤压方向的微米级亚晶粒结构。在500℃下进行各种初始应变率的拉伸试验，拉伸轴平行于挤出方向。结果表明，当Al_3Ni颗粒仅沿晶界存在时，伸长率随凹形向下应变率而变，其中伸长率-应变率曲线向较高应变率和较高伸长率方向移动。在这种情况下，测试材料在6.3 x 10〜（-3）s〜（-1）的初始应变速率下表现出类似超塑性的行为，最大伸长率约为300％，初始硬化后的流动曲线几乎表现出理想的塑性，应变率敏感度约为0.26，并且仍保留具有[111]纤维织构的亚晶粒结构。如果还存在颗粒内Al_3Ni颗粒，这些颗粒的位错钉扎会导致较大的初始加工硬化率，较高的加工硬化率，及早缩颈和延展性较差。

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