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Title: Development of quaternary Ir-Ta-Ni-Al refractory superalloys

Abstract

To improve the performance of Ir-based alloys, the authors propose alloys designed by combining Ir- and Ni-based alloys because Ni-based alloys are ductile, have a relatively low density (about 8.5g/cm{sup 3}, compared to 22g/cm{sup 3} for Ir), and low cost. The objective is to combine the high-temperature strength of Ir-based alloys with the good ductility, low density, and low cost of Ni-based alloys. If the fcc and L1{sub 2} phases with coherent structure form in both alloys, the authors expect that the fcc and L1{sub 2} two-phase regions of the Ir- and Ni-based alloys will connect with each other at the interface of the Ir-based and Ni-based alloys. The coherency of the fcc/L1{sub 2} phase is very important for quaternary alloys to achieve high strength at high temperature. The authors chose the Ir-Ta alloy from the available Ir-based binary alloys because the strength of the Ir-Ta binary alloy is high at high temperature (over 700 MPa at 1,200 C) and because Ta has a solid solution hardening effect in Ni-based alloys. For the Ni alloy, they chose the Ni-Al alloy because it is of coherent structure of fcc and L1{sub 2}. They therefore studied the strength and microstructure of Ir-Ta-Ni-Almore » quaternary alloys.« less

Authors:
; ; ; ;  [1]
  1. National Research Inst. for Metals, Tsukuba, Ibaraki (Japan)
Publication Date:
OSTI Identifier:
691323
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 41; Journal Issue: 6; Other Information: PBD: 20 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; COMPRESSION STRENGTH; IRIDIUM ALLOYS; TANTALUM ALLOYS; NICKEL ALLOYS; ALUMINIUM ALLOYS; PHASE DIAGRAMS; CONCENTRATION RATIO; DENDRITES

Citation Formats

Yu, Xihong, Yamabe-Mitarai, Yoko, Ro, Yoshikazu, Gu, Yuefeng, and Harada, Hiroshi. Development of quaternary Ir-Ta-Ni-Al refractory superalloys. United States: N. p., 1999. Web. doi:10.1016/S1359-6462(99)00112-8.
Yu, Xihong, Yamabe-Mitarai, Yoko, Ro, Yoshikazu, Gu, Yuefeng, & Harada, Hiroshi. Development of quaternary Ir-Ta-Ni-Al refractory superalloys. United States. doi:10.1016/S1359-6462(99)00112-8.
Yu, Xihong, Yamabe-Mitarai, Yoko, Ro, Yoshikazu, Gu, Yuefeng, and Harada, Hiroshi. Fri . "Development of quaternary Ir-Ta-Ni-Al refractory superalloys". United States. doi:10.1016/S1359-6462(99)00112-8.
@article{osti_691323,
title = {Development of quaternary Ir-Ta-Ni-Al refractory superalloys},
author = {Yu, Xihong and Yamabe-Mitarai, Yoko and Ro, Yoshikazu and Gu, Yuefeng and Harada, Hiroshi},
abstractNote = {To improve the performance of Ir-based alloys, the authors propose alloys designed by combining Ir- and Ni-based alloys because Ni-based alloys are ductile, have a relatively low density (about 8.5g/cm{sup 3}, compared to 22g/cm{sup 3} for Ir), and low cost. The objective is to combine the high-temperature strength of Ir-based alloys with the good ductility, low density, and low cost of Ni-based alloys. If the fcc and L1{sub 2} phases with coherent structure form in both alloys, the authors expect that the fcc and L1{sub 2} two-phase regions of the Ir- and Ni-based alloys will connect with each other at the interface of the Ir-based and Ni-based alloys. The coherency of the fcc/L1{sub 2} phase is very important for quaternary alloys to achieve high strength at high temperature. The authors chose the Ir-Ta alloy from the available Ir-based binary alloys because the strength of the Ir-Ta binary alloy is high at high temperature (over 700 MPa at 1,200 C) and because Ta has a solid solution hardening effect in Ni-based alloys. For the Ni alloy, they chose the Ni-Al alloy because it is of coherent structure of fcc and L1{sub 2}. They therefore studied the strength and microstructure of Ir-Ta-Ni-Al quaternary alloys.},
doi = {10.1016/S1359-6462(99)00112-8},
journal = {Scripta Materialia},
number = 6,
volume = 41,
place = {United States},
year = {1999},
month = {8}
}