Mechanical Properties of Nb-18Si-5Mo-5Hf-2C In-Situ Composite Prepared by Arc-Casting Method
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- Kim Jin-Hak
- Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology
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- Tabaru Tatsuo
- Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology
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- Hirai Hisatoshi
- Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology
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- Kitahara Akira
- Collaboration Department, National Institute of Advanced Industrial Science and Technology
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- Hanada Shuji
- Institute for Materials Research, Tohoku University
書誌事項
- タイトル別名
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- Mechanical Properties of Nb-18Si-5Mo-5Hf-2C <I>In-Situ</I> Composite Prepared by Arc-Casting Method
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Niobium-base in-situ composite, Nb–18Si–5Mo–5Hf–2C (in mol%), was fabricated by arc-casting method and heat-treated at 2070 K for 20 h in vacuum. The microstructure is composed of Nb solid solution (NbSS) matrix phase and secondary phase of Nb5Si3. The Nb5Si3 was found to have two kinds of structure: one is the α phase reported in the Nb–Si binary phase diagram and the other is a hexagonal phase with Mn5Si3-type structure. To evaluate the mechanical properties of the composite, nano-indentation hardness tests and tensile tests were conducted. The hardness and elastic modulus at ambient temperature were evaluated using nano-indentation hardness tester and the tensile properties were examined by an Instron-type materials testing machine at temperatures of 300, 1470, 1570, 1670 and 1770 K, and at an initial strain rate of 1×10−4 s−1. The hardness and elastic modulus of the NbSS phase are 480 GPa and 170 GPa and those of the silicide are 1480 GPa and 380 GPa. The composite exhibited the excellent ultimate tensile strength of 450 MPa at 1470 K, and the brittle to ductile transition temperature is between 1470 and 1570 K . The fracture behavior of the in-situ composite is complex, however, involving cleavage of the Nb5Si3, NbSS/Nb5Si3 interface separation, ductile rupture of the NbSS and correlations of these.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 43 (9), 2201-2204, 2002
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390001204247030144
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- NII論文ID
- 10012325974
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- NII書誌ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD38XnvFGqsLw%3D
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 6312659
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可