The tensile tests in combination with the electron microscopy and X-ray technique have provided data on the mechanical properties of the ultrafine-grained (UFG) shape-memory Cu–14 wt % Al–3 wt % Ni alloy at different temperatures and its fracture character. The UFG structure in the alloy has formed during severe plastic deformation performed by high pressure torsion. The study has shown two variants of the mechanical behavior of the UFG alloy depending on the temperature and strain rate during mechanical testing. The first case is the deformation of the alloy in the martensitic state at moderate test temperatures (300, 423, 473 K). This stage is characterized by a high hardening coefficient and moderate uniform relative elongation and reduction. The second case is deformation at higher test temperatures (573, 673 K). It is characterized mainly by large uniform localized plastic deformation and moderate hardening due to dynamic recrystallization.

结合电子显微镜和 X 射线技术的拉伸试验提供了超细晶粒 (UFG) 形状记忆 Cu-14 wt % Al-3 wt % Ni 合金在不同温度下的力学性能及其断裂的数据特点。合金中的UFG结构是在高压扭转造成的剧烈塑性变形过程中形成的。该研究表明，UFG 合金的机械行为有两种变体，具体取决于机械测试期间的温度和应变率。第一种情况是合金在中等测试温度（300、423、473 K）下马氏体状态下的变形。这个阶段的特点是高硬化系数和适度均匀的相对伸长率和收缩率。第二种情况是在较高的测试温度（573、673 K）下发生变形。