Nitrogen induced amorphization observed by X-ray and neutron diffractions in the immiscible VCu system
Nitrogen induced amorphization observed by X-ray and neutron diffractions in the immiscible VCu system
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通过 X 射线和中子衍射观察不混溶 VCu 体系中氮诱导的非晶化
DOI：
10.1016/0022-3093(94)90217-8
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
U. Mizutani
中科院分区：
文献类型：
--
作者：
T. Fukunaga;N. Kuroda;Chung;T. Koyano;U. Mizutani
氮气气氛下的机械合金化（MA）可以使v70 Cu 30粉末非晶化，两者的组合具有正混合热。X射线衍射观察到的结构因子sx (Q)随着磨矿时间的增加逐渐转变为非晶态的结构特征。在铣削200 h后，用中子衍射观察到的sn (Q)也证实了非晶相的形成，并残留了纯Cu。由于V原子在中子衍射中的相干散射长度小到可以忽略不计，因此可以识别为fcc Cu。在铣削40和120 h时，在S N (Q)中Q= 4.25 a￣−1处出现了一个新的峰值，但在铣削200 h时，该峰值消失了，这是由于Cu原子溶解到bcc V晶格结构中形成了bcc Cu晶体。结果表明：bcc固溶体是在铣削初期形成的，而非晶化是在铣削后期随着N原子的加入而逐渐发生的。
Mechanical alloying (MA) under N 2 gas atmosphere is proved to be capable of amorphizizing V 70 Cu 30 powders, the combination of which has a positive heat of mixing. The structure factor, S X (Q), observed by X-ray diffraction gradually changes into a structure characteristic of an amorphous state with increasing milling time. The S N (Q) observed by neutron diffraction after 200 h of milling also confirmed the formation of an amorphous phase with residual pure Cu. Since the coherent scattering length of the V atom in neutron diffraction is negligibly small, crystalline peaks can be identified as fcc Cu. The growth of a new peak at Q= 4.25 A ̊− 1 in the S N (Q) was observed after 40 and 120 h of milling but disappeared when milling time reached 200 h. This peak is attributed to the formation of the bcc Cu crystal by dissolution of Cu atoms into bcc V lattice structure. The results are consistent with the conclusion that the bcc solid solution is formed at the early stage of milling but that the amorphization gradually proceeds in the subsequent stage of milling by incorporating N atoms into the bcc solid solution.