Alloying effects of the elements with a positive heat of mixing on the glass forming ability of Al-La-Ni amorphous alloys  

作　　者：CHEN ZiPan GAO JingEn WU Yuan WANG Hui LIU XiongJun LU ZhaoPing 

机构地区：[1]State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第1期122-127,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51010001 and 51001009);the 111 Project(Grant No.B07003);the Program for Changjiang Scholars and Innovative Research Team in University

摘　　要：The effects of Sn and Ga additions on the glass forming ability （GFA） of （A186LasNi9）100_xSnx（x=0, 0.2, 0.3, 0.5, 0.7, 1 and 2 at.%） and （Al86LasNi9）100_xGax（x=0, 0.2, 0.5, 1 and 1.5 at.%） alloys were systematically investigated. Unlike common microal- loying methods, both Sn and Ga have a positive heat of mixing with the main component of A1. Our analysis confirmed that proper Sn addition can suppress the strong formation of a-A1 and enhance the GFA due to the positive heat of mixing between Sn and AI and the large difference in their atomic sizes. While the addition of Ga to the base alloy acted as the nucleation cites for ct-Al and accelerated precipitation of the ct-A1 phase, thus deteriorating the GFA.The effects of Sn and Ga additions on the glass forming ability(GFA)of(Al86La5Ni9)100 xSnx(x=0,0.2,0.3,0.5,0.7,1 and 2at.%)and(Al86La5Ni9)100 xGax(x=0,0.2,0.5,1 and 1.5 at.%)alloys were systematically investigated.Unlike common microalloying methods,both Sn and Ga have a positive heat of mixing with the main component of Al.Our analysis confirmed that proper Sn addition can suppress the strong formation ofα-Al and enhance the GFA due to the positive heat of mixing between Sn and Al and the large difference in their atomic sizes.While the addition of Ga to the base alloy acted as the nucleation cites forα-Al and accelerated precipitation of theα-Al phase,thus deteriorating the GFA.

关 键 词：Al-based glass-forming ability positive heat of mixing metallic glass 

分 类 号：TG139.8[一般工业技术—材料科学与工程]