Microstructure and properties of a beta-solidifying TiAl-based alloy with different refiners  

作　　者：Ning Cui Xiao-Peng Wang Fan-Tao Kong Yu-Yong Chen Hai-Tao Zhou 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology [2]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology

出　　处：《Rare Metals》2016年第1期42-47,共6页稀有金属（英文版）

基　　金：financially supported by the National Nature Science Foundation of China(No.51471056);the State Key Laboratory for Advanced Metal and Materials Foundation(No.2013-ZD06);the National Basic Research Program of China(No.2011CB605502)

摘　　要：This study systematically compared the influences of yttrium（Y）,boron（B）,and carbon（C） on the microstructural refinement and properties of a Ti-43Al-5Nb alloy.The microstructural refinement effect in the TiAl alloy closely depends on the refiner used.The refinement effects of the three elements on colony size and lamellar thickness can be arranged as B 〉 Y 〉 C and Y 〉 C 〉 B,respectively.Moreover,a microstructure with a small grain size and ultra-fine lamellar spacing can be obtained by adding B and Y or B and C.The mechanical properties of TiAl alloy are also influenced by the refiners.TiAl alloys with proper B and Y contents exhibit favorable hot workability,tensile properties,and fracture toughness,whereas the C-containing alloy displays poor tensile properties and low fracture toughness.These results indicate that Y and B are more suitable microstructure refiners than C.This study may serve as a reference for practical alloying design.This study systematically compared the influences of yttrium（Y）,boron（B）,and carbon（C） on the microstructural refinement and properties of a Ti-43Al-5Nb alloy.The microstructural refinement effect in the TiAl alloy closely depends on the refiner used.The refinement effects of the three elements on colony size and lamellar thickness can be arranged as B 〉 Y 〉 C and Y 〉 C 〉 B,respectively.Moreover,a microstructure with a small grain size and ultra-fine lamellar spacing can be obtained by adding B and Y or B and C.The mechanical properties of TiAl alloy are also influenced by the refiners.TiAl alloys with proper B and Y contents exhibit favorable hot workability,tensile properties,and fracture toughness,whereas the C-containing alloy displays poor tensile properties and low fracture toughness.These results indicate that Y and B are more suitable microstructure refiners than C.This study may serve as a reference for practical alloying design.

关 键 词：TiAl alloy REFINEMENT TOUGHNESS Tensileproperties WORKABILITY 

分 类 号：TE96[石油与天然气工程—石油机械设备] TG146.23[一般工业技术—材料科学与工程]