THERMAL-STABILITY OF AL65CU20FE15 QUASI-CRYSTAL STUDIED BY X-RAY-DIFFRACTION AND MOSSBAUER-EFFECT MEASUREMENTS

被引：0
作者：
LIN, CM
LIN, ST
机构：
来源：
CHINESE JOURNAL OF PHYSICS | 1993年 / 31卷 / 02期
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The temperature dependence of the mean-square displacement of Fe atoms in an as-quenched Al65Cu20Fe15 alloy in the temperature range of 4.2-1023 K has been measured by means of the Mossbauer spectroscopy. The vibrational behavior of the Fe atoms below 673 K can be well described using the Debye approximation with THETA(D) = 389 K. Above about 673 K, the Al65Cu20Fe15 alloy decomposes into Al2Cu3 and Al13Fe4. However, the rate of decomposition slows down, when the phason strains in the as-quenched Al65Cu20Fe15 alloy are released above around 903 K. In the present work, we confirm that the icosahedral phase in the Al65Cu20Fe15 alloy is not a stable equilibrium state above about 673 K.
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页码：297 / 304
页数：8
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