The role of dispersed particles in strengthening and fracture mechanisms in a Mo-ZrC alloy processed by mechanical alloying |
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Authors: | T Takida M Mabuchi N Nakamura T Igarashi Y Doi T Nagae |
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Affiliation: | (1) Present address: the R & D Division, Tokyo Tungsten Co., Ltd., 931-8543 Toyama, Japan;(2) the National Industrial Research Institute of Nagoya, 462-8510 Nagoya, Japan;(3) Sumitomo Electric Industries, Ltd., 554-0024 Osaka, Japan;(4) the Toyama Industrial Technology Center, 933-0981 Tokaoka, Japan |
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Abstract: | The tensile properties of a ZrC particle-dispersed Mo, which was processed by spark plasma sintering with mechanically alloyed
powder, were investigated at room temperature and at elevated temperatures of 1170 to 1970 K. The Mo-ZrC alloy showed much
higher strength at room temperature than a fully recrystallized pure Mo. The high strength of Mo-ZrC is mainly attributed
to a very small grain size (about 3 μm). The main role of the ZrC particle is not to increase strength due to the particle-dislocation interaction, but to limit
grain growth during sintering and to attain the very small grain size. The elongation at room temperature of Mo-ZrC was much
lower than that of pure Mo. This is probably related to the higher interstitial contents. However, Mo-ZrC showed a large elongation
of 180 pct at 1970 K and 6.7×10−4 s−1. It was suggested that the ZrC particles stabilized the fine-grained microstructure yet provided no cavitation sites at 1970
K; as a result, the large elongation was attained. |
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