期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.07.074
关键词
Tungsten; Ultrafine-grained; Ductile-to-brittle transition
Rods of commercial-purity tungsten were subjected to severe plastic deformation by means of equal-channel angular pressing (ECAP). An ultrafine-grained (UFG) equiaxed microstructure with an average grain size of about 0.9 mu m was developed. Microhardness measurements in a wide range of temperatures suggest a ductile-to-brittle transition at temperatures below 350 degrees C in the UFG samples after ECAP. In contrast, the results on the as-received material suggest a ductile-to-brittle transition temperature above 483 degrees C. 0 2008 Elsevier B.V. All rights reserved.
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