TY - JOUR
T1 - Role of dispersed particles in strengthening and fracture mechanisms in a Mo-ZrC alloy processed by mechanical alloying
AU - Takida, T.
AU - Mabuchi, M.
AU - Nakamura, N.
AU - Igarashi, T.
AU - Doi, Y.
AU - Nagae, T.
PY - 2000
Y1 - 2000
N2 - 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 6.7×10-1. 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.
AB - 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 6.7×10-1. 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.
UR - http://www.scopus.com/inward/record.url?scp=0033893738&partnerID=8YFLogxK
U2 - 10.1007/s11661-000-0013-6
DO - 10.1007/s11661-000-0013-6
M3 - 学術論文
AN - SCOPUS:0033893738
SN - 1073-5623
VL - 31
SP - 715
EP - 721
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 3
ER -