Ductilization of TiAl intermetallic alloys by neutron-irradiation

被引：27

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.

引用

页码：179 / 184

页数：6

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