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晶粒间界局域无序化引起的滞弹性弛豫

程波林 , 葛庭燧

金属学报

研究了高纯铝竹节晶界的弛豫行为。首次发现竹节晶界的弛豫强度与温度密切相关,它随着温度降低而显著减小,在约0.4Tm(Tm是熔点绝对温度)处变为零。这反映晶界结构在中温处出现局域无序化。本文结果与晶界发生局域无序现象的原子模拟图象一致。

关键词: 晶界局域无序 , internal friction , micro-creep , high purity Al

ANELASTIC RELAXATIONS ASSOCIATED WITH LOCAL DISORDERING AT GRAIN BOUNDARIES

CHENG bolin GE Tingsui (T.S.Ke) Laboratory of Internal Friction and Defects in Solids , Institute of Solid State Physics , Academia Sinica , Hefei , China Professor Laboratory of Internal Friction and Defects in Solids , Institute of Solid State Physics , Academia Sinica , Hefei , 230031

金属学报(英文版)

Internal friction and micro-creep measurements were performed with high-purity aluminium bamboo-crystal specimens.The relaxation strength was found to decrease with the decrease of temperature and became zero at about 0.4 T_m(T_m is the melting temperature).This re- flects the occurrence of local disordering in the bamboo boundary region at this temperature. This result conforms to the picture of grain-boundary disordering constructed by atomic simulation studies.

关键词: Grain boundary disordering , null , null , null

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