Study of the effects of Zr addition on the microstructure and properties of Nb-Ti-Si based ultrahigh temperature alloys |
| |
| Affiliation: | 1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500058, India;2. Department of Metallurgical and Materials EngineeringInstitute, Indian Institute of Technology Madras, Chennai-600036, India;1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China;2. Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing, 100191, China;1. National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. AVIC Manufacturing Technology Institute, Beijing 100024, China |
| |
| Abstract: | The effects of alloying with Zr on the microstructure, mechanical and oxidation properties of Nb-Ti-Si based ultrahigh temperature alloys have been investigated in this study. The microstructures of the all alloys were comprised of primary γ(Nb,X)5Si3 blocks, Nbss and eutectic colonies, and the additions of Zr do not affect the microstructure and phase constituents of Nb-Ti-Si based alloys. Zr improves both the room-temperature toughness and the high-temperature strength. The alloy with addition of 8 at.% Zr shows the highest fracture toughness of 15.01 Mpa·m1/2. The compressive strengths of the alloys are improved to 278.89–293.08 MPa for the Zr-containing alloys when compare with the Zr-free alloy (194.23 MPa). The oxidation resistance of the alloys was also obviously ameliorated with Zr addition, showing a reduced weight gain with the increase of Zr content. |
| |
| Keywords: | Silicides Oxidation Fracture toughness Microstructure Electron microscopy scanning |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
