把MAEAM与Milstein改进的Born力学稳定性判据相结合,讨论了fcc晶体Ag在单轴裁荷下的力学稳定性和理论强度.结果表明,在压缩过程中,晶体结构首先转变为无应力不稳定的bcc相,随后通过消耗内能自发地转变为另一个无应力的bct亚稳相.计算的bcc和fcc相的结构能量差与实验值很符合,其力学稳定性范围为-2.076～4.390GPa,相应的应变范围为-7.972%～8.672%.
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