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Sung Hwan Hong等人对含Zr 0~15%(原子分数)的NiTiHfZr四元合金进行研究,发现Zr的添加导至B19’马氏体相晶格常数和单斜晶角发生变化。随Zr含量增加,相转变温度及屈服强度逐渐增高,Zr增高到7%(原子分数)时,出现双屈服点和二步相转变,而Zr为10%~15%(原子分数)时则出现单屈服点和一步相转变。这种差异主要是由于铸态合金的马氏体孪晶模式,Zr含量增高导至马氏体转变时晶格扭曲,提
Sung Hwan Hong et al. Studied a NiTiHfZr quaternary alloy containing 0-15% Zr (atomic fraction) and found that the lattice constant and the monoclinic angle of the martensite phase after addition of Zr are changed. With the increase of Zr content, the phase transition temperature and yield strength increase gradually. When the Zr content increases to 7% (atomic fraction), double yield point and two-phase transformation appear, while Zr is 10% -15% (atomic fraction) A single yield point and a phase change. This difference is mainly due to the as-cast martensitic twinning mode, Zr content increases lead to the lattice distortion when the martensitic transformation, to mention