Strength and ductility improvement of ultrafine-grained tungsten produced by equal-channel angular pressing

In this study, equal-channel angular pressing (ECAP) was employed to refine the grain size of tungsten at relatively low temperatures. The small punch (SP) test results show that the ultrafine-grained tungsten appears an evident improvement in both strength and ductility compared with primary coarse...

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Bibliographic Details
Published in:Journal of nuclear materials 2014-12, Vol.455 (1-3), p.595-599
Main Authors: Hao, T., Fan, Z.Q., Zhang, T., Luo, G.N., Wang, X.P., Liu, C.S., Fang, Q.F.
Format: Article
Language:English
Subjects:
Ductility
Ductility tests
Equal channel angular pressing
Grain size
Nuclear engineering
Punches
Strength
Tungsten
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Summary:In this study, equal-channel angular pressing (ECAP) was employed to refine the grain size of tungsten at relatively low temperatures. The small punch (SP) test results show that the ultrafine-grained tungsten appears an evident improvement in both strength and ductility compared with primary coarse-grained tungsten. The analysis results from SP test data indicate that the ductile-to-brittle transition temperature (DBTT) of the ultrafine-grained tungsten decrease to 386 [degrees]C and 322 [degrees]C due to the ECAP processing at 800 [degrees]C and 950 [degrees]C, respectively. The reason of the improvement in both strength and ductility of the ultrafine-grained tungsten produced by ECAP is discussed.
ISSN:0022-3115
DOI:10.1016/j.jnucmat.2014.08.044