Nanometer-scale, fully lamellar microstructure in an aged TiAl-based alloy

被引：47
|
作者：
Sun, YQ [1 ]
机构：
[1] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1998年 / 29卷 / 11期
关键词：
D O I：
10.1007/s11661-998-0308-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This article reports on the optical microscopy, transmission electron microscopy, and hardness experiments conducted on a Ti-45Al-2Cr-Nb alloy that was aged between 400 degrees C and 800 degrees C. The aging treatment was conducted on specimens that were quenched to retain the high-temperature alpha/alpha 2 structure. The aging treatment produced an ultrafine, nanometer-scale, fully lamellar microstructure, ranging from 8 nm in thickness at 600 degrees C to 17 nm at 700 degrees C. The fine lamellar microstructure produced a large strengthening effect, raising the hardness to 540 on the Vickers scale. The lamellar structure nucleates preferentially at grain boundaries and grows into the grain interior.
引用
收藏
页码：2679 / 2685
页数：7
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