Ductilization of TiAl intermetallic alloys by neutron-irradiation

被引：26
|
作者：
Hishinuma, A [1 ]
Fukai, K [1 ]
Sawai, T [1 ]
Nakata, K [1 ]
机构：
[1] HITACHI LTD,HITACHI RES LAB,HITACHI,IBARAKI 317,JAPAN
来源：
INTERMETALLICS | 1996年 / 4卷 / 03期
关键词：
titanium aluminides; based on TiAl; mechanical properties at ambient temperature; ductility; twinning; radiation effects; hot isostatic pressing; isothermal forging;
D O I：
10.1016/0966-9795(95)00030-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Post-irradiation tensile properties of Ti-rich TiAl (approximately Ti-47at% Al) intermetallic alloys, produced from the powder product manufactured by a plasma rotating electrode process (PREP), are investigated. The TiAl alloy powders are hot isostatic pressed (HlPed) into a cylindrical large compact, and then consolidated and formed by isothermal hot-forging (IHF). The final duplex structure of the alloys consists of equiaxial grains of the Ti3Al and TiAl(gamma) phases with a grain size of approximately 2 mu m in diameter. An increase in ductility from 6.0 to 10.3% with a slight increase in yield strength, is observed in specimens tested at 873 K after neutron irradiation at 873 K to a dose of 1 x 10(20) n cm(-2) (E > 1 MeV) in JRR-2. This phenomenon can be understood by a mechanism that involves twin's, which are believed to play an important role in the deformation process, nucleating during irradiation and growing during tensile testing after irradiation.
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页码：179 / 184
页数：6
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