稀土元素对Al-Ni-Gd-Y合金晶化行为的影响

Effects of rare-earth (RE) elements on crystallization behavior of Al-Ni-Gd-Y amorphous alloy

利用差示扫描量热仪（DSC）、X射线衍射（XRD）、透射电镜（TEM）研究了稀土元素（RE）对Al-Ni-Gd-Y非晶合金晶化行为的影响．Al-Ni-Gd-Y非晶合金的初始晶化温度随着稀土元素含量的增加而升高．在Al（88-x）Ni6Gd6Yx（x=1，2，3，4）系中，随着Y含量的增加，初始晶化产物由面心立方Al（fcc—Al）变成为fcc—Al＋Al3Gd／Al3Y＋未知相．研究了热处理工艺对Al86Ni8Gd3Y3合金力学性能的影响，其中，当Al86Ni8Gd3Y3在568K下保温10min时，其显微硬度及韧性较高，析出尺寸为1～3nm的fcc-Al纳米晶颗粒．

The effects of rare-earth （RE） elements on the crystallization behavior of Al-Ni-Gd-Y amorphous alloy were investigated by differential scanning calorimetry（DSC）, X-ray diffraction （XRD） and transmission electron microscopy（TEM）. The first crystallization temperature of Al-Ni-Gd-Y amorphous alloy in- creases with RE content. In the alloy Al（88-x）Ni6Gd6Yx （x = 1,2,3,4）, the crystallization phase changes from fcc-Al to fcc-Al ＋ Al3 Gd/Al3 Y ＋ unknown phase when the Y content increasing. The effect of heat-treatment on the mechanical property of Al-Ni-Gd-Y alloy was also investigated. The AlssNisGd3Y3 alloy was of high microhardness and good ductility after heat-treatment at 568 K for 10 min and fine precipitation of fcc Al with size of 1 -3 nm was found in the alloy.