Origin of tweed in Au-Cu-Al alloys

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	Origin of tweed in Au-Cu-Al alloys
	J. Y. Liu; Z. Q. Liu; X. J. Jin
	2014
发表期刊	Philosophical Magazine
ISSN	1478-6435
卷号	94 期号:1 页码:56-72
摘要	The premartensitic tweed in Au-Cu-Al alloys, contrary to previous thought that resort to defects, is confirmed to be associated with the coherent embryos of an intermediate phase (I phase) embedded in parent phase. The parentI phase transformation temperature was measured by differential scanning calorimeter and dynamic mechanical analysers, which shifts from 82.3 to 557.6 degrees C depending on the alloy composition. X-ray diffraction and transmission electron microscopes (TEM) results show that the parentI phase transformation is a charge density wave transition that cannot be suppressed even by melt-spun method, which shows obvious compositional inhomogeneity between I phase and parent. The results imply that the parentI phase transition is a fast displacive transformation coupled with diffusion. Moreover, accompanying the parentI phase transformation, alloys demonstrate diversified microstructure revealed by TEM observation, from tweed to chessboard nanowires or twins. These findings provide the experimental evidence for that parentI phase transformation in Au-Cu-Al alloys is originated from pseudospinodal decomposition as theoretically predicted.
部门归属	[liu, jiayi ; jin, xuejun] shanghai jiao tong univ, sch mat sci & engn, state key lab met matrix composite, shanghai 200240, peoples r china. [liu, zhiquan] chinese acad sci, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; jin, xj (reprint author), shanghai jiao tong univ, sch mat sci & engn, state key lab met matrix composite, shanghai 200240, peoples r china. ; jin@sjtu.edu.cn
关键词	Metastable Phases Martensites Nanoscale Precipitates Tweed Decomposition Transmission Electron-microscopy Striped-type Superstructure Shape-memory Alloys Ti-ni Martensitic Transformations Phase Transformation Decomposing Alloys Gum Metal R-phase Nanostructure
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72399
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Y. Liu,Z. Q. Liu,X. J. Jin. Origin of tweed in Au-Cu-Al alloys[J]. Philosophical Magazine,2014,94(1):56-72.
APA	J. Y. Liu,Z. Q. Liu,&X. J. Jin.(2014).Origin of tweed in Au-Cu-Al alloys.Philosophical Magazine,94(1),56-72.
MLA	J. Y. Liu,et al."Origin of tweed in Au-Cu-Al alloys".Philosophical Magazine 94.1(2014):56-72.