材料期刊网

TEM specimen preparation for Al-based amorphous alloys

Hongwang YANG , Xinchun CHANG , Wanliang HOU , Jianqiang WANG

材料科学技术（英文）

Transmission electron microscopy (TEM) is usually used to identify the amorphicity. However, some artifacts may be introduced due to improper TEM foil preparation. In this paper, three Al-rich metallic glasses with and without a glass transition were selected for characterizing the effect of the electropolishing condition on the as-quenched structure during TEM specimen preparation. It is shown that the occurrence of the modulated bright-dark structure under TEM observation is closely sensitive to the electropolishing condition, which suggests us being careful about the possible artifacts induced by specimen preparation when examining amorphous alloys under TEM.

关键词: Al-based amorphous alloy , null , null

TEM Specimen Preparation for Al-based Amorphous Alloys

材料科学技术（英文）

关键词:

Al--Co--Y体系中富 Al区非晶相的形成与结构演化

董盼 , 张甲 , 常新春 , 侯万良 , 全明秀 , 王建强

金属学报

系统研究了铝基非晶态合金Al-Co-Y体系中富Al区的非晶形成能力。形成非晶结构最佳成分为Al88Co5Y7，条带临界厚度为230 μm。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Trg 和 ΔTx 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，Al3Y和 Al9Co2相。

关键词: 铝基非晶态合金 , glass forming ability , microstructure evolution