|Origin of tweed in Au-Cu-Al alloys|
|J. Y. Liu; Z. Q. Liu; X. J. Jin
|Source Publication||Philosophical Magazine
|Abstract||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.|
; 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.
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.
J. Y. Liu,Z. Q. Liu,&X. J. Jin.(2014).Origin of tweed in Au-Cu-Al alloys.Philosophical Magazine,94(1),56-72.
J. Y. Liu,et al."Origin of tweed in Au-Cu-Al alloys".Philosophical Magazine 94.1(2014):56-72.
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