Design of near-α Ti alloys via a cluster formula approach and their high-temperature oxidation resistance

作     者：Beibei Jiang Donghui Wen Qing Wang Jinda Che Chuang Dong Peter K. Liaw Fen Xu Lixian Sun 

作者机构：Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Ministry of Education) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Department of Materials Science and Engineering The University of Tennessee Knoxville Tennessee 37996 USA Guangxi Key Laboratory of Information Materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2019年第35卷第6期

页      面：1008-1016页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Key Research and Development Plan(No.2017YFB0702400) the Science Challenge Project(No.TZ2016004) the National Magnetic Confinement Fusion Energy Research Project(No.2015GB121004) the Foundation of Guangxi Key Laboratory of Information Materials(No.161002-K) 

主　　题：Near-α Ti alloys Composition design Cluster formula approach Oxidation resistance Mechanical property 

摘      要：The multi-component composition characteristics of high-temperature near-α Ti alloys were investigated in the present work by means of a cluster formula approach. The uniform cluster formula [CN12 cluster](glue atom)3 for the hexagonal close-packed α solid solution was first obtained based on the Friedel oscillation theory, with a total atom number in the formula of Z = 16. Then it was analyzed that the Z values in the cluster composition formulas of typical near-α Ti alloys are within the range of Z = 16.0016.30, being perfectly consistent with the ideal Z = 16. Based on it, a series of new alloys with Z = 16 and with Nb/Ta substitution for Mo in Ti1100 alloy were designed, suction-cast into φ 6 mm rods, and then heat-treated with solid solution and aging. It was found that the alloy with co-addition of Mo, Ta and Nb has a high strength and good ductility at both room and high temperatures. More importantly, the additions of Nb and Ta can contribute to the formation of continuous and compact Al2O3 scales, resulting in an obvious improvement of oxidation resistances at both 923 K and 1073 K. The effects of Mo, Ta and Nb on the oxidation behaviors of the designed alloys at 1073 K were further discussed.