Effects of Initial States on the Spinodal Decomposition of Quenched and Melt-Spun Cu-15Ni-8Sn Alloy
Effects of Initial States on the Spinodal Decomposition of Quenched and Melt-Spun Cu-15Ni-8Sn Alloy
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DOI：
10.2320/matertrans.m2014234
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发表时间：
2015-01-01
影响因子：
1.2
通讯作者：
Nakashima, Hiromichi
中科院分区：
文献类型：
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作者：
Kondo, Shin-ichiro;Masusaki, Akinori;Nakashima, Hiromichi
通过X射线衍射（XRD）分析、透射电子显微镜（TEM）和电子衍射分析，研究了快淬Cu-15 Ni-8 Sn合金（快淬样品）亚稳分解的早期阶段，并与相同成分的非快淬Cu-15 Ni-8 Sn合金（快淬样品）进行了比较。在XRD测量中，在350 ℃老化120分钟后，在熔纺样品中没有发现（200）面的边带，而在350 ℃下热处理60 min后的淬火样品中发现了它们。在350 ℃下老化60 min后淬火样品的TEM观察表明存在调制结构（λ = 5-10 nm），而相同热处理后的熔纺样品的那些也表明存在调制结构（λ：太小而无法测量）。电子衍射图案揭示卫星结构在两个样品中，虽然与超晶格反射从淬火样品中可见的有序相。这些差异可能是由于在其各自的淬火状态下存在的团簇的大小的差异;在熔纺样品中，由于高冷却速率（约8 × 10（5）摄氏度/秒），团簇的大小要小得多。
We investigate early stages of spinodal decomposition in a melt-spun Cu-15Ni-8Sn alloy (melt-spun samples) by X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) and electron diffraction analysis through comparison against a non-melt-spun alloy of the same composition (quenched samples). In XRD measurements, no sidebands of (200) planes are found in the melt-spun sample after aging at 350 degrees C for 120 min, whereas they are found in the quenched sample after a heat treatment at 350 degrees C for 60 min. TEM observations of a quenched sample after aging at 350 degrees C for 60 mm indicate the presence of a modulated structure (lambda = 5-10 nm) in the matrix, whereas those of a melt-spun sample after the same heat treatment also indicate the presence of a modulated structure (lambda: too small to measure). Electron diffraction patterns reveal satellite structures in both samples, although with superlattice reflections from ordering phases visible in the quenched sample. These differences are presumably due to a difference in the size of clusters present in their respective quenched states; in melt-spun samples, cluster size was much smaller as a result of a high cooling rate (approximate to 8 x 10(5)degrees C/s).