Mg-Cu-Ni-Gd非晶合金结构弛豫及力学性能

STRUCTURAL RELAXATION AND MECHANICAL PROPERTIES OF Mg-Cu-Ni-Gd AMORPHOUS ALLOYS

采用差示扫描热分析仪(DSC/DTA),X射线衍射(XRD)和透射电镜(TEM)研究了Mg-CH-Ni-Gd系非晶合金的结构弛豫以及力学性能,分析了Ni元素对Mg基非晶合金的结构弛豫和力学性能的影响.结果表明,Mg_(65)Cu(25)Gd_(10)非晶合金在305 K下保温180 s发生结构弛豫后,出现约1-2 nm的中程有序畴.采用Ni元素部分取代Cu元素,可提高合金抗结构弛豫能力和力学性能.

The structural relaxation and glass-forming ability （GFA） of Mg-Cu-Ni-Gd glassy alloys and the effects of Ni addition on structural relaxation and mechanical properties were studied by thermal analysis, XRD and TEM. The medium-range order （MRO） zones of about 1--2 nm size were observed in the Mg65Cu25Gd10 glassy alloy after structural relaxation caused by annealing for 180s at 305K. Partial substitution of Cu by Ni in Mg-Cu-Gd-based alloys not only improved the mechanical properties, but also increased the stability against structural relaxation.