SYNTHESIS, PROCESSING AND PROPERTIES OF NANOPHASE ALUMINIDE

被引：22

作者：

CHANG, H

HOFLER, J

ALTSTETTER, C

AVERBACK, R

机构：

[1] Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, IL

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1992年 / 153卷 / 1-2期

关键词：

D O I：

10.1016/0921-5093(92)90269-7

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper presents recent results on the production and properties of compacts of ultrafine powders of gamma-TiAl. Metallic vapor was produced by magnetron sputtering of a TiAl target and inert gas-mediated condensation of nanometer sized particles. After collection, the particles were compacted in situ under ultrahigh vacuum conditions. The material was characterized by X-ray diffraction and hardness as a function of sintering time and temperature. Greater than 95% density was achieved in the compacts after sintering for 2 h at 450-degrees-C at which time the average grain size was still less than 20 nm. Hardness was measured as a function of grain size, and normal Hall-Petch behavior was observed, but only at grain sizes above approximately 30 nm, at which point a hardness of 12 GPa was measured. At finer particle sizes the hardness decreased with decreasing grain size.

引用

页码：676 / 678

页数：3