论文部分内容阅读
用传统的粉末冶金技术已生产了等原子成份的Ti-Ni试样,报导了压制压力、烧结温度和粉末粒度对烧结制品尺寸变化的影响。在烧结过程中,试样尺寸变化出现各向异性,即径向膨胀,轴向收缩,同时,试样密度降低。从金相资料来看,可以认为这些观测结果是与Ti和Ni的互扩散速率不同以及在压坯中粉末粒度偏析有关。由于孔隙促进了马氏体的成核过程,从而,烧结制品呈现出明显的形状记忆行为。
Ti-Ni samples of equal atomic composition have been produced using conventional powder metallurgy techniques and reported the effect of pressing pressure, sintering temperature and powder particle size on the dimensional change of the sintered product. During the sintering process, the sample size changes anisotropy, that is, radial expansion, axial contraction, while reducing the sample density. From the metallographic data, it can be considered that these observations are related to the different interdiffusion rates of Ti and Ni and segregation of the powder particle in the green compact. As the pores promote the nucleation of the martensite, the sintered product exhibits a significant shape memory behavior.