CAJ | 학술논문

近等原子比热轧态NiTi合金板材有较显著的择优取向，使该合金的相变伪弹性呈现明显的各向异性.拉伸实验表明：拉伸轴沿与轧向成45°夹角的方向，相变伪弹性最好；沿轧向，次之；沿横向，最差.文中对NiTi织构进行了取向分布函数定量分析，并改进了NiTi单晶相变应变的晶格变形矩阵理论，以取向分布密度为加权因子，对该合金多晶的相变伪弹性进行了计算机模拟，所得结果与实测值吻合得较好.
근등원자비열알태NiTi합금판재유교현저적택우취향，사해합금적상변위탄성정현명현적각향이성.랍신실험표명：랍신축연여알향성45°협각적방향，상변위탄성최호；연알향，차지；연횡향，최차.문중대NiTi직구진행료취향분포함수정량분석，병개진료NiTi단정상변응변적정격변형구진이론，이취향분포밀도위가권인자，대해합금다정적상변위탄성진행료계산궤모의，소득결과여실측치문합득교호.
A modified model based on Phenomenological theory of martensitic transformation was used to predict the transformation strain anisotropy of NiTi single crystals. The texture of polycrystalline NiTi were determined using ODF (Orientation Distribution Function). The crystallographic textures and tensile pseudo-elasticity at different angles to the rolling direction were correlated by averaging the transformation strain of constituent grains (single crystals) weighted with the respective orientation distribution densities. The calculated and experimental strains are well compatible despite the discrepancy due to the hypothesis of unconstrained grain deformation in polycrystalline alloys.