Effects of rare-earth (RE) elements on crystallization behavior of Al-Ni-Gd-Y amorphous alloy
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摘要: 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)Ni6Gd6Y x ( 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.Abstract: 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 increases with RE content. In the alloy Al(88- x )Ni6Gd6Y x ( x =1,2,3,4), the crystallization phase changes from fcc-Al to fcc-Al+Al3Gd/Al3Y+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 Al86Ni8Gd3Y3 alloy was of high microhardness and good ductility after heat-treatment at 568K for 10min and fine precipitation of fcc Al with size of 1~3nm was found in the alloy.
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Key words:
- rare-earth elements (RE) /
- amorphous alloy /
- crystallization /
- mechanical properties
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