Zr50-xCu50Alx(x=0～25)合金中的二十面体团簇以及Al添加对非晶形成能力和结构转变的影响

功能材料, 2010, 41(6): 1042-1045.

Zr50-xCu50Alx(x=0～25)合金中的二十面体团簇以及Al添加对非晶形成能力和结构转变的影响

徐勇 ^1, , 张勇 ^2, , 汤方立 ^3, , 刘雄军 ^4, , 陈国良 ^5,

1.北京科技大学,新金属材料国家重点实验室,北京,100083

2.北京科技大学,新金属材料国家重点实验室,北京,100083

3.北京科技大学,新金属材料国家重点实验室,北京,100083

4.北京科技大学,新金属材料国家重点实验室,北京,100083

5.北京科技大学,新金属材料国家重点实验室,北京,100083

基金项目: 国家自然科学基金资助项目(50431030;50471097)

关键词：二十面体相 , 非晶形成能力 , 原子结构 , 金属玻璃

Effect of Al addition and icosahedral clusters on glass-forming ability and local structure of Zr50-xCu50Alx(x=0-25) alloys

采用X射线衍射(XRD)和扫描电子显微镜(SEM)技术研究了Al元素的添加以及二十面体团簇结构对不同冷却速率下Zr50-xCu50Alx(x=0～25)合金的非晶形成能力、合金结构以及相变过程的影响.结果表明,对直径＞3mm的Zr45Cu50Al5合金,其主相为ZrCu和二十面体相,而对于直径为3mm的Zr45Cu50Al5合金,其主相则为ZrCu和非晶相.二十面体相的衍射峰强度随着冷却速率的增加而大大降低,直至变成弥散峰.反映出二十面体相与非晶相之间存在强烈的关联性.Zr-Cu-Al合金中的非晶相与二十面体相具有相同的短程有序结构,即二十面体团簇结构,这种5次对称的原子堆垛结构与周期性有序的晶体结构互不相容,从而起到阻碍结晶、提高非晶形成能力的作用.

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