材料期刊网

黄铜脱锌体扩散机制研究

姚禄安 , 邱万川 , 甘复兴 , 郭海

腐蚀科学与防护技术

应用电化学和表面分析技术研究了砷对H_(62)与H_(68)黄铜脱锌效应研究。脱锌深度(D)与含砷量(C)服从下列关系式:D=D_0/ (1_B·C~n)。用正电子湮没技术测得了τ_2值且与双空位(τ_(2))值相符。脱锌后τ_2的相对强度变化量△I_2与平均寿命变化量△τ_m包含着脱锌深度D的信息。这就为锌在优先溶解过程中双空位体扩散机制提供了直接证据。

关键词: 黄铜脱锌 , Volume diffusion , Positron lifetime , Divacancies

Precipitation Study in Inconel 625 Alloy by Positron Annihilation Spectroscopy

M.Ahmad , W.Ahmad , M.A.Shaikh , Mahmud Ahmad , M.U.Rajput

材料科学技术（英）

Precipitation in Inconel 625 alloy has been studied by positron annihilation spectroscopy and electron microscopy. The observed dependence of annihilation characteristics on aging time is attributed to the change of the positron state due to the increase and decrease of the density and size of the γ″ precipitates. Hardness measurements and lifetime measurements are in good agreementr

关键词: Positron lifetime , null , null , null , null

Investigation of Subboundaries Evolution in Superplastically Deformed NiAl by Positron Lifetime

Xinghao DU , Jianting GUO , Bide ZHOU , Liangyue XIONG

材料科学技术（英）

In order to study the subboundaries evolution in superplastically deformed NiAl, the positron lifetime change during superplastic deformation process was measured. It is shown that the superplastic deformation of NiAl has not influence on its τ2, the newly recrystallized grain boundaries formed during entire superplastic deformation process belong to the calegory of subboundaries and have not contribution to the superplastic strain.

关键词: NiAl , null , null , null

Precipitation Study in Inconel 625 Alloy by Positron Annihilation Spectroscopy

材料科学技术（英）

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