Al-Co-Y体系中富Al区非晶相的形成与结构演化  

AMORPHOUS PHASE FORMATION AND MICROSTRUCTURE EVOLUTION IN THE Al-RICH REGION OF Al-Co-Y SYSTEM

作　　者：董盼[1] 张甲[1] 常新春[1] 侯万良[1] 全明秀[1] 王建强[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2008年第2期227-232,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金50471075和50471076~~

摘　　要：系统研究了铝基非晶态合金AI-Co-Y体系中富AI区的非晶形成能力形成非晶结构最佳成分为Al_(88)Co_5Y_7,条带临界厚度为230μm.此体系的玻璃形成能力对合金成分十分敏感.具有高的玻璃形成能力的合金未呈现出明显的玻璃转变特征.相对T_(rg)和△T_X判据,"相选择"理论在寻找最佳合金成分和表征玻璃形成能力与成分的关系中更为有效。在非晶相的形成过程中,其主要竞争相为fcc-Al,Al_3Y和Al_9Co_2相.AlssNisYsCo2 has the highest glass forming ability in Al-based amorphous alloys to date. To locate the optimum composition in its basic system is of great importance for preparing Al-based bulk metallic glass. Al-Co-Y system has not been studied thoroughly as yet. In this work, it is indicated that AlssCosY7 is the best alloy and its critical thickness is up to 230μm. The glass forming ability shows a strong dependence on composition in this system. Surprisingly, there is no obvious glass transition phenomenon upon heating in the best glass formation alloy. Compared with Trg and ATx criteria, phase selection method is proved to be effective to locate the optimum alloy and characterize the glass forming ability dependence on composition in this system, fcc-Al, Al3Y and Al9Co2 are the competing phases with amorphous phase during its formation.

关 键 词：铝基非晶态合金 玻璃形成能力 结构演化 

分 类 号：TG139.8[一般工业技术—材料科学与工程]