Zr对Y_(56)Al_(24)Co_(20)非晶形成能力和热稳定性的影响

Influence of Zr content on forming ability and thermal stability of Y_(56)Al_(24)Co_(20) amorphous alloy

以Y56Al24Co20非晶合金为基础合金系,用廉价Zr替代部分高价Y,通过单辊急冷法成功地制备出Y56?x-ZrxAl24Co20(x=5,10,15)非晶合金;通过X射线衍射(XRD)和差示扫描量热法(DSC)研究其非晶形成能力和热稳定性。结果表明,随Zr含量增加,合金的非晶形成能力提高,但当Zr含量超过10%(摩尔分数)时,其非晶形成能力反而降低;Y46Zr10Al24Co20具有最大的非晶形成能力和良好的热稳定性。以上结果均从组元个数、原子半径、混合热和电负性的角度进行了实验论证。

Amorphous ribbon specimens of Y56_xZrxAl24Co20（x=5, 1 0, 1 5） were prepared by a single roller melt-spinning technique in argon atmosphere using cheaper Zr instead of long price Y, its forming ability and thermal stability have been studied by X-ray diffraction（XRD）, scanning electron microscopy（SEM）. The results show that the forming ability of Y56_xZrxAl24Co20（x=5, 10, 15） alloys increase with the increasing of Zr content, however when the Zr content is beyond 10%（molar fraction）, it decreases oppositely. Y46Zr10Al24Co20 has the maximum forming ability of amorphous crystal and good thermal stability. In addition, the above experimental results have been proved through the elements of alloy system, atomic radius, mixing heat and electronegativity.