Be对Al-La-Ni合金玻璃形成能力的影响(英文)  

Effects of Be Addition on the Glass Forming Ability of the Al-Ni-La Alloys

作　　者：彭伟杰[1] 郝国建[1] 张勇[1] 陈国良[1] 吕昭平[1] 徐勇[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2008年第A04期704-707,共4页Rare Metal Materials and Engineering

基　　金：Supported in Part by National Natrue Science Foundation of China (50725104);by "973 program" (Contract 2007CB613903)

摘　　要：铍是半径最小的金属元素,它在锆基、钛基及其他很多种合金体系中显示出非常重要的作用,极大的提高了合金的非晶形成能力。基于这些特点,我们将铍引入铝基非晶合金,在AlLaNi合金中加入不同比例的铍(1at%～10at%),通过X射线衍射仪,扫描电镜,差热分析仪等研究合金的显微结构和铍对合金非晶形成能力及热力学参数的影响。结果显示1at%到5at%的铍的添加,提高了合金的玻璃形成能力,其中含有1at%铍的合金具有最高的玻璃形成能力及高的热稳定性。Based on the assumption that atomic size of Be is so small that we can expect more efficient packing in glass-forming alloys. Six quaternary alloys with a nominal composition Al86-xLa5Ni9Bex （x=0, , , 5, 7, 10 at%） have been prepared to understand small atomic size effect in the Al-based glass-forming alloys. The glass-forming ability and stability of the supercooled liquid of these Al-based alloys have been studied by X-ray diffractometry（XRD）, differential scanning calorimetry（DSC） and differential thermal analysis（DTA）. It has been found that addition of 1% Be （at an off-eutectic composition） results in the highest values of GFA parameters, the highest thermal stability and the highest first peak in DSC curve as compared with the Al86-xLa5Ni9Bex（x=, 5 at%） alloys, and the GFA have been enhanced in the alloys with 1%～5% Be. In addition, the microstructure of alloys containing different Be additions have also been observed by scanning electron microscopy（SEM）.

关 键 词：大块非晶 铝基合金 偏共晶 铍 

分 类 号：TG139.8[一般工业技术—材料科学与工程]