Microstructure and mechanical properties of Ti44Al6Nb alloys with different cerium contents

作     者：Hong-Ze Fang Rui-Run Chen Xiao-Yu Chen Zhi-Kun Ma Hong-Sheng Ding Jing-Jie Guo Hong-Ze Fang;Rui-Run Chen;Xiao-Yu Chen;Zhi-Kun Ma;Hong-Sheng Ding;Jing-Jie Guo

作者机构：School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Department of Tank RepairPeople's Liberation Army Armored Force Engineering InstituteChangchun 130117China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2020年第39卷第4期

页      面：402-407页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science of Foundation of China(No.51274076) the Program of New Century Excellent Talents in University(No.NCET12-0153) the National Basic Research Program of China(No.2011CB605504) 

主　　题：Ce TiAl alloy Compressive property Grain refining 

摘      要：Ti44A16 Nb-based alloy ingots with different cerium(Ce)contents(0,0.05,0.10,0.15,0.20;at%)were prepared by non-consumable vacuum arc smelting furnace(WK-Ⅱ).The surface quality,macrostructure,microstructure,compressive properties and fracture morphology of these ingots were *** results show that Ce has few influences on the surface *** can refine grain size and the average grain size decreases from 0.50 to 0.19 mm with the increase of Ce ***,the microstructure morphology of these ingots changes from large lamellar microstructure to dual-phase *** addition of Ce,CeO and AlCe3 are formed during melting and solidifying,which act as the core of heterogeneous nucleation and refine the *** compressive testing results show that Ce can improve strength and *** ultimate compressive strength increases from 1156.2 to 1472.2 MPa with Ce content increasing from 0 at%to 0.20 at%.The compression ratio is improved from 10.2%to 15.3%with Ce content increasing from 0 at%to 0.10 at%.The refined crystalline strengthening and grain boundary strengthening are the main reasons for the improvement of compressive property.