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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Effects of processing parameters on tensile properties and hardness of thixoformed ZA27 alloy
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Effects of processing parameters on tensile properties and hardness of thixoformed ZA27 alloy

机译：工艺参数对触变ZA27合金拉伸性能和硬度的影响

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摘要

The influences of processing parameters, reheating temperature, reheating period of time and die temperature on tensile properties of thixoformed Zr modified ZA27 alloy were investigated. Simultaneously, the hardness of the alloy was also examined. The results indicated that the thixoforming process significantly improved both ultimate tensile strength and elongation of the alloy because of obvious decreasing of porosities, compared with the semi-solid die-cast no modified ZA27 alloy and permanent mould cast Zr modified ZA27 alloy. The tensile cracks initiated from the defects, such as voids, porosities and inclusions, and eutectic cell boundaries between primary particles, and then preferentially grew along eutectic structure, regardless of the processing parameters. The hardness was mainly affected by the solubility of Zn in the primary particles, the primary particle fraction and the amount of the decomposed primary particles. The hardness HB could be calculated from the micro-hardness HB_P of the primary particles, HB_e of the matrix and the primary particle fraction f_p according to an equation of HB = HB_p f_p + HB_e (l-f_p).
机译：研究了工艺参数，再加热温度，再加热时间和模具温度对触变成型Zr改性ZA27合金拉伸性能的影响。同时，还检查了合金的硬度。结果表明，与半固态压铸未改性ZA27合金和永久铸模Zr改性ZA27合金相比，触变性显着提高了合金的极限抗拉强度和伸长率，原因是孔隙率明显降低。拉伸裂纹从缺陷开始，例如空隙，孔隙和夹杂物，以及初级粒子之间的共晶晶胞边界，然后沿共晶结构优先生长，而与加工参数无关。硬度主要受Zn在初级颗粒中的溶解度，初级颗粒分数和分解的初级颗粒的量影响。硬度HB可以根据HB = HB_p f_p + HB_e（l-f_p）的等式，由一次颗粒的显微硬度HB_P，基体的HB_e和一次颗粒分数f_p计算得出。

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