采用激光热解法制备了单相γ-Fe(N)纳米微粒(N含量(原子分数)为5.9%)并研究了微粒的马氏体相变特征.结果表明,纳米微粒的马氏体相变温度远低于相同成分的块体材料.探讨了微粒尺寸影响相变温度的机理,认为表面应力导致的附加压应力是纳米微粒马氏体相变温度降低的重要原因.采用高压压结(0.5-4.0 GPa)导致微粒的塑性变形,从而诱发马氏体相变.研究了高压压结对纳米微粒的马氏体相变以及微结构的影响.
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