Microstructure Characterization and Fracture Toughness of Laves Phase-Based Cr–Nb–Ti Alloys
来源期刊：Acta Metallurgica Sinica2015年第4期
论文作者：Yun-Long Xue Shuang-Ming Li Hong Zhong Lai-Ping Li Heng-Zhi Fu
文章页码：514 - 520
摘 要：Three Laves phase-based alloys with nominal compositions of Cr2Nb–x Ti（x = 20,30,40,in at%） have been prepared through vacuum non-consumable arc melting.The results show that the microstructures of Cr2Nb-（20,30） Ti alloys are composed of the primary Laves phase C15–Cr2（Nb,Ti） and bcc solid solution phase,while the microstructure of Cr2Nb–40Ti alloy is developed with the eutectic phases C15–Cr2（Nb,Ti）/bcc solid solution.The measured fracture toughness of ternary Laves phase C15–Cr2（Nb,Ti） is about 3.0 MPa m1/2,much larger than 1.4 MPa m1/2for binary Laves phase Cr2 Nb.Meanwhile,the fracture toughness of Cr2Nb–x Ti（x = 20,30,40） alloys increases with increasing Ti content and reaches 10.6 MPa m1/2in Cr2Nb–40Ti alloy.The eutectic microstructure and addition of Ti in Cr2 Nb are found to be effective in toughening Laves phase-based alloys.
Yun-Long Xue1，Shuang-Ming Li1，Hong Zhong1，Lai-Ping Li2，Heng-Zhi Fu1
1. State Key Laboratory of Solidification Processing,Northwestern Polytechnical University2. Northwest Institute for Non-Ferrous Metal Research
摘 要：Three Laves phase-based alloys with nominal compositions of Cr2Nb–x Ti（x = 20,30,40,in at%） have been prepared through vacuum non-consumable arc melting.The results show that the microstructures of Cr2Nb-（20,30） Ti alloys are composed of the primary Laves phase C15–Cr2（Nb,Ti） and bcc solid solution phase,while the microstructure of Cr2Nb–40Ti alloy is developed with the eutectic phases C15–Cr2（Nb,Ti）/bcc solid solution.The measured fracture toughness of ternary Laves phase C15–Cr2（Nb,Ti） is about 3.0 MPa m1/2,much larger than 1.4 MPa m1/2for binary Laves phase Cr2 Nb.Meanwhile,the fracture toughness of Cr2Nb–x Ti（x = 20,30,40） alloys increases with increasing Ti content and reaches 10.6 MPa m1/2in Cr2Nb–40Ti alloy.The eutectic microstructure and addition of Ti in Cr2 Nb are found to be effective in toughening Laves phase-based alloys.
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