Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 10    No. 6    December 2000

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Crystalline structure and morphology of Xphase in Cu-Al-Ni-Mn-Ti alloy①
WANG Ming-pu(汪明朴), YANG Jie(杨 杰), LI Zhou(李 周),
WANG Yan-hui(王艳辉), WANG Zhi-wei(王志伟)

Department of Materials Science and Engineering, Central South University,
Changsha 410083, P.R.China

Abstract:The composition, morphology, crystalline structure and formation and evolution ofXphase in a Cu-12.3Al2Ni-2Mn-1Ti alloy were studied. The results show that theXphase is a Ti-rich phase with atomic ratio of (Cu+Ni)∶ Ti∶Al=2∶1∶1 and DO3or L21structure; it is directly formed in the liquid phase by crystallization in the process of solidification of the alloy; there forms free particleXphase through the progressive dissolution and breakdown of the inter-dendritic microstructure in the following homogenization process. TheXphase has three different morphologies, i.e.XL, XLSandXS, whose contents in the matrix rely on the heat-treatment conditions.


Key words: Cu-Al-Ni-Mn-Ti alloy;Xphase; crystalline structure; morphology

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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