【摘要】 采用纳米压痕法研究了氢对Ni50Mn30Ga20取向多晶室温纳米压痕蠕变和压痕塑性形变的影响.结果表明,Ni50Mn30Ga20取向多晶在室温下能够发生纳米压痕蠕变.在试样室温真空充氢之后,引入的氢不仅能够促进纳米压痕蠕变,还可以使得马氏体相变的"伪弹性"存储的弹性能得以释放,发生逆转变,使部分塑性变形回复.更多还原

【Abstract】 The effect of hydrogen on nanoindentation creep at room temperature and plastic deformation of nanoindentation in preferentially orientated polycrystalline Ni50Mn30Ga20 was investigated by nanoindentation. The results show that nanoindentation creep in the preferentially orientated polycrystalline Ni50Mn30Ga20 could occur at room temperature. After the specimens was hydrogen charged in vacuum at room temperature,the introduced hydrogen could not only promote the nanoindentation creep,but also release the elastic energy stored in martensitic pseudoelasticity and induce reversible martensitic transformation,which resulted in the partial recovery of plastic deformation.更多还原