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首页> 外文期刊>Metallurgical and Materials Transactions A >Processing and Characterization of Cu-Al-Ni Shape Memory Alloy Strips Prepared from Prealloyed Powder by Hot Densification Rolling of Powder Preforms
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Processing and Characterization of Cu-Al-Ni Shape Memory Alloy Strips Prepared from Prealloyed Powder by Hot Densification Rolling of Powder Preforms

机译：粉末预成型坯热致密化轧制由预合金粉末制备的Cu-Al-Ni形状记忆合金带的加工与表征

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The present work deals with the preparation of near-full density Cu-Al-Ni shape memory alloy (SMA) strips from argon-atomized prealloyed powder via a powder metallurgy (PM) route comprising cold die compaction to prepare powder preforms, sintering, and hot densification rolling of unsheathed sintered powder preforms under protective atmosphere at 1273 K (1000 °C). It has been shown that argon-atomized spherical Cu-Al-Ni SMA powder consisted of very fine equiaxed grains and no appreciable grain growth occurred during sintering at 1273 K (1000 °C). It also has been shown that no appreciable densification occurred during sintering, and densification was primarily achieved by hot rolling. The densification behavior of the sintered powder preforms during hot rolling was discussed. The hot-rolled Cu-Al-Ni strips were heat-treated at 1223 K (950 °C) for 60 minutes and water quenched. The heat-treated strips consisted of equiaxed grains with average size approximately 90 μm. The heat-treated Cu-Al-Ni SMA strips consisted of self-accommodated b1¢ beta_{1}^{'} martensite primarily, and showed smooth b1 Þ b1¢ beta_{1} Rightarrow beta_{1}^{'} transformation behavior coupled with a very low hysteresis (≈25 K (25 °C)). The heat-treated strips exhibited an extremely good combination of mechanical properties with fracture strength of 530 MPa and 12.3 pct fracture strain. The mode of fracture in the finished strip was primarily void-coalescence-type ductile together with some brittle transgranular type. The shape memory tests showed almost 100 pct one-way shape recovery after 100 bending-unconstrained heating cycles at 4 pct applied prestrain, exhibiting good stability of Cu-Al-Ni strips under thermomechanical actuation cycling. The two-way shape memory strain was found approximately 0.45 pct after 15 training cycles at 4 pct training strain.
机译：本工作涉及通过粉末冶金（PM）路线从氩原子化的预合金粉末制备接近全密度的Cu-Al-Ni形状记忆合金（SMA）薄带，包括冷模压实以制备粉末预成型件，烧结和在1273 K（1000°C）的保护气氛下，无护套的烧结粉末预成型坯的热致密化轧制。结果表明，氩原子雾化的球形Cu-Al-Ni SMA粉末由非常细的等轴晶粒组成，并且在1273 K（1000°C）的烧结过程中没有出现明显的晶粒生长。还显示出在烧结期间没有发生明显的致密化，并且致密化主要是通过热轧实现的。讨论了粉末预成型坯在热轧过程中的致密化行为。将热轧的Cu-Al-Ni带材在1223 K（950°C）热处理60分钟，然后水淬。热处理的条带由平均尺寸约为90μm的等轴晶粒组成。热处理过的Cu-Al-Ni SMA带主要由自适应的b 1 ¢ beta_ {1} ^ {'}马氏体组成，并显示出光滑的b 1 Þb 1 ¢ beta_ {1}右箭头beta_ {1} ^ {'}转换行为以及非常低的磁滞（≈25K（ 25°C））。热处理的钢带表现出机械性能的极佳组合，断裂强度为530 MPa，断裂应变为12.3 pct。最终带材的断裂方式主要是空凝型延性和一些脆性的穿晶型。形状记忆测试显示，在施加4 pct的预应变100次弯曲无约束的加热循环后，几乎100 pct的单向形状恢复，在热机械驱动循环下，Cu-Al-Ni条带表现出良好的稳定性。在4 pct训练应变的15个训练周期后，发现双向形状记忆应变约为0.45 pct。

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