GRAIN-BOUNDARY SEGREGATION IN Al-10%Mg ALLOYS AT HOT WORKING TEMPERATURES
GRAIN-BOUNDARY SEGREGATION IN Al-10%Mg ALLOYS AT HOT WORKING TEMPERATURES
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DOI：
10.1016/s1359-6454(98)00038-x
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发表时间：
1998-06
期刊：
影响因子：
9.4
通讯作者：
Xiang Liu;J. B. Adams
中科院分区：
文献类型：
--
作者：
Xiang Liu;J. B. Adams
采用蒙特卡罗模拟方法测定了Al-10%Mg合金在热加工温度下不同晶界处的Mg富集情况。在模拟中使用的原子间势是用力匹配方法得到的。Mg在晶界的偏析水平在20% ~ 40%之间。用原子大小和局部静水应力解释了不同晶界位置的偏析富集差异。偏析水平在[110]倾斜边界从低角度到高角度变化强烈，而在[100]扭转边界变化最小。发现偏析水平与晶界能有一定的相关性。与纯铝的断裂能相比，Mg偏析对晶界脱粘的影响是适度的（10—35%）。
Monte-Carlo simulations are done to determine Mg enrichment at various grain-boundaries of Al–10%Mg alloys at hot working temperatures. The interatomic potentials used in the simulations are developed using the force-matching method. The Mg segregation levels at the grain-boundaries are found to vary from 20% to 40%. The segregation enrichment differences at different grain-boundary sites are explained in terms of atomic size and local hydrostatic stress. The segregation level varies strongly with [110] tilt boundaries from low to high angle while showing minimal variation with [100] twist boundaries. Segregation levels are found to have some correlation with grain-boundary energy. The effect on grain-boundary decohesion due to Mg segregation is found to be a modest (10--35%) reduction in fracture energy compared to the fracture energy in pure Al.