Abstract

The properties of a Ti₅₀Pd₄₀Ni₁₀ alloy (at %) with a high-temperature shape memory effect (SME) are studied on samples manufactured from a 2.04-mm-thick strip after various annealing and strain-creation conditions. Data on the elemental and local phase compositions, the grain sizes and the microhardness, the phase transformation temperatures, and the mechanical and thermomechanical characteristics have been obtained. The best average shape memory characteristics (ε_SME = 4.3%, η_SME = 0.57) are found to be obtained for the alloy samples subjected to vacuum annealing (600°C, 1 h) on heating to 500°C (stable end of SME) after the tensile strain preliminarily induced at a temperature of 380–370°C (after heating to 450°C) at a rate \(\dot {\varepsilon }\) ≈ 3.1 × 10^–3 s^–1 and the same degree of total induced strain ε_t = 11%. In this case, the average temperatures of the start and finish of the main shape recovery are A_s SME = 418°C and A_f SME = 435°C, respectively. These thermomechanical characteristics are acceptable for an alloy chosen for creation of safety devices, e.g., of a cutting type, in which thermosensitive elements have a tray shape.

中文翻译：

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退火对具有高温形状记忆效应的 Ti50Pd40Ni10 合金机械和热机械特性的影响在带材上进行研究

摘要

具有高温形状记忆效应 (SME)的 Ti ₅₀ Pd ₄₀ Ni ₁₀合金 (at %) 的性能在由 2.04 毫米厚的带材在各种退火和应变产生条件后制成的样品上进行了研究。已经获得了元素和局部相组成、晶粒尺寸和显微硬度、相变温度以及机械和热机械特性的数据。最佳平均形状记忆特性（ε _SME = 4.3%，η _SME= 0.57) 对于在 380-370° 的温度下初步诱导拉伸应变后，在加热至 500°C（SME 的稳定端）时进行真空退火（600°C，1 小时）的合金样品获得C（加热至 450°C 后）以\(\dot {\varepsilon }\) ≈ 3.1 × 10 ^–3 s ^–1和相同程度的总诱导应变 ε _t = 11%。在这种情况下，主要形状恢复开始和结束的平均温度为A _{s SME} = 418°C 和A _{f SME}= 435°C，分别。这些热机械特性对于为制造安全装置而选择的合金是可接受的，例如切割类型的，其中热敏元件具有托盘形状。