Correlation between liquid structure and γ₂-phase precipitation of Cu-Al-Ni shape memory alloys

来源期刊：中国有色金属学报(英文版)2002年第5期

论文作者：潘学民 边秀房 孙景芹 王伟民

文章页码：829 - 832

Key words：CuAlNi alloy; liquid structure; shape memory alloy; X-ray diffraction

Abstract: Cu₇₁Al₂₅Ni₄ (mole fraction,%) shape memory alloy ribbons exhibit a good shape memory effect, which were prepared by melt-spinning technique. The microstructure of the as-spun ribbons was identified by D/Max-rA X-ray diffractometer. The order degree of martensite increases with decreasing liquid quenching temperature at the same quenching rate. The liquid structure of Cu₇₅Al₂₅ and Cu₇₁Al₂₅Ni₄ was investigated using X-ray diffraction method. The distinct pre-peaks have been found in front of main peaks of the structure factors. The pre-peak increases intensity with decreasing temperature or adding Ni. Gaussian peaks decomposing radial distribution function (RDF) indicated that Cu-Al distance is anomalously short. These results suggest that a strong interaction between Cu and Al is favorable to form β-phase-like clusters, which leads to chemical medium-range ordering in melt. This promotes formation of order martensite and suppresses γ₂-phase precipitation.