TY - JOUR
T1 - Effect of microstructural continuity on room-temperature fracture toughness of ZrC-added MoSiB alloys
AU - Nakayama, Shunichi
AU - Sekido, Nobuaki
AU - Uemura, Sojiro
AU - Tsurekawa, Sadahiro
AU - Yoshimi, Kyosuke
N1 - Funding Information:
This work was supported by the Advanced Low Carbon Technology Research and Development Problem (ALCA) of the Japan Science and Technology Agency (JST).
Publisher Copyright:
© 2018 The Japan Institute of Metals and Materials.
PY - 2018
Y1 - 2018
N2 - The room-temperature fracture toughness of ZrC-added MoSiB alloys prepared using an arc-melting technique was investigated. The constituent phases of the heat-treated alloys were mainly molybdenum solid solution (Moss), Mo5SiB2 (T2), and ZrC, with a small amount of Mo2B in a few alloys. Four-point bending tests with a Chevron-notch were performed, and the average fracture-toughness values ranged from 12.4 to 20.3 MPa(m)1/2 depending on alloy composition. Here, the effects of the volume fractions of the constituent phases and the continuity of Moss on the fracture toughness are discussed. The fracture toughness improved with an increase in the volume fractions of the Moss and ZrC phases. Alloys with a higher Moss continuity exhibited higher fracture toughness, for example, the fracture toughness of 64.5Mo3.2Si6.5B12.9Zr12.9C (mol.%) was 19 MPa(m)1/2; the alloy contained a >95%-continuous Moss phase, even though it also contained 16 vol.% T2 and 23 vol.% ZrC.
AB - The room-temperature fracture toughness of ZrC-added MoSiB alloys prepared using an arc-melting technique was investigated. The constituent phases of the heat-treated alloys were mainly molybdenum solid solution (Moss), Mo5SiB2 (T2), and ZrC, with a small amount of Mo2B in a few alloys. Four-point bending tests with a Chevron-notch were performed, and the average fracture-toughness values ranged from 12.4 to 20.3 MPa(m)1/2 depending on alloy composition. Here, the effects of the volume fractions of the constituent phases and the continuity of Moss on the fracture toughness are discussed. The fracture toughness improved with an increase in the volume fractions of the Moss and ZrC phases. Alloys with a higher Moss continuity exhibited higher fracture toughness, for example, the fracture toughness of 64.5Mo3.2Si6.5B12.9Zr12.9C (mol.%) was 19 MPa(m)1/2; the alloy contained a >95%-continuous Moss phase, even though it also contained 16 vol.% T2 and 23 vol.% ZrC.
KW - Continuity
KW - Fracture toughness
KW - Microstructure
KW - Molybdenumsiliconboron alloys
KW - Zirconium carbide
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U2 - 10.2320/matertrans.MJ201613
DO - 10.2320/matertrans.MJ201613
M3 - Article
AN - SCOPUS:85045112386
SN - 1345-9678
VL - 59
SP - 518
EP - 527
JO - Materials Transactions
JF - Materials Transactions
IS - 4
ER -