采用耦合应力的晶体相场法,研究纳米晶在单向拉伸过程中,大角度晶界和小角度晶界的运动,以及诱发晶体长大机制的联系.结果表明,在单向拉伸过程中,应力诱发了晶体长大,并且存在着晶界迁移和晶体转动两种机制,这两种机制相互影响联系.小角度晶界上位错的运动使得晶界消失,并引起晶体的转动而发生晶体合并,而大角度晶界表现为曲率诱发晶界运动,高能晶界逐渐消失,低能晶界生长;在晶界的迁移过程中,当晶粒尺寸足够小时,引发了晶体的转动,从而加快了晶体的长大.
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