FCC/HCP Martensitic Transformation and High-Temperature Shape Memory Properties in Co-Si Alloys
FCC/HCP Martensitic Transformation and High-Temperature Shape Memory Properties in Co-Si Alloys
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DOI：
10.2320/matertrans.47.2377
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发表时间：
2006-09
影响因子：
1.2
通讯作者：
T. Omori;W. Ito;K. Ando;K. Oikawa;R. Kainuma;K. Ishida
中科院分区：
文献类型：
--
作者：
T. Omori;W. Ito;K. Ando;K. Oikawa;R. Kainuma;K. Ishida
利用光学显微镜、透射电镜、差示扫描量热仪和形状记忆试验研究了Co-Si二元合金的显微组织、马氏体相变温度和形状记忆性能。在室温下观察到具有六方密排（hcp）结构的“马氏体相”与面心立方（fcc）母相共存。当Si含量达到4mol%时，马氏体相变温度随Si含量的增加而线性增加，当Si含量超过4mol%时，马氏体相变温度趋于平缓，而相变滞后和相变间隔则单调增加。Co-Si合金在高达900 ℃的高温下具有形状回复性，在高达600 ℃的高温下具有相对较高的热稳定性。这些结果表明Co-Si合金系具有制备高温形状记忆合金的可能性。[doi：10.2320/matertrans.47.2377]
The microstructure, martensitic transformation temperatures and shape memory properties of Co-Si binary alloys were investigated by means of optical and transmission electron microscopy, differential scanning calorimetry and a shape memory test. The " martensite phase with a hexagonal close-packed (hcp) structure was observed to coexist with the face-centered cubic (fcc) � parent phase at room temperature. The �=" martensitic transformation temperatures linearly increased with Si content up to 4 mol%, but the trend flattened beyond 4 mol%Si while the transformation hysteresis and intervals monotonously increased. The Co-Si alloys exhibited shape recovery at high temperatures up to 900 � C and a relatively high thermal stability up to 600 � C. These results suggest that Co-Si alloy system has a possibility for high-temperature shape memory alloys. [doi:10.2320/matertrans.47.2377]