CAJ | 학술논문

采用基于赝势平面波方法的第一性原理计算，详细研究了TiNiZr高温形状记忆合金的相稳定性、弹性和电子结构等性质。结果表明，由于较低的形成能，添加的Zr元素优先占据TiNi合金的Ti位。少量Zr含量的添加，TiNiZr合金的相稳定性增强，然后随着Zr含量的增加而降低。根据TiNiZr合金B2相的弹性系数讨论了TiNiZr合金的马氏体相变温度和相变类型。弹性系数C44对TiNiZr合金的马氏体相变温度有很大的作用。Ni d态和Zr d态杂化作用的增强导致了马氏体相变温度的升高。
채용기우안세평면파방법적제일성원리계산，상세연구료TiNiZr고온형상기억합금적상은정성、탄성화전자결구등성질。결과표명，유우교저적형성능，첨가적Zr원소우선점거TiNi합금적Ti위。소량Zr함량적첨가，TiNiZr합금적상은정성증강，연후수착Zr함량적증가이강저。근거TiNiZr합금B2상적탄성계수토론료TiNiZr합금적마씨체상변온도화상변류형。탄성계수C44대TiNiZr합금적마씨체상변온도유흔대적작용。Ni d태화Zr d태잡화작용적증강도치료마씨체상변온도적승고。
Phase stability,elastic property and electronic structure of TiNiZr high-temperature shape memory alloys have been investigated by first-principles calculations by using the pseudopotentials plane-wave method. The results showed that the added Zr preferentially occupies the Ti sites in TiNi alloy due to the lowest formation energy. The phase stability of TiNiZr alloys first increased with a small addition of Zr and then decreased with the increasing of Zr content. Based on the elastic constants of the TiNiZr alloys with B2 phases,the martensitic transformation temperature and transformation type were discussed. The elastic constant C44 had the great effect on the martensitic transformation temperature of the TiNiZr alloys. The increase of the martensitic transformation behind the elastic properties resulted from the stronger hybridization between Ni d and Zr d states.