[G] Mechanical Properties of Materials and Sturucture (2)

[41] Effect of Lamellar Structure Morphology on Fatigue Crack Growth Behavior of Wrought TiAl Based Alloy

*Ryosuke YAMAGATA¹, Akihiro HANADA², Hirotoyo NAKASHIMA¹, Masao TAKEYAMA¹ (1. School of Materials and Chemical Technology, Tokyo Institute of Technology, 2. School of Materials and Chemical Technology, Tokyo Institute of Technology (Present: Kobe Steel, Ltd.))

Keywords:TiAl基合金、疲労き裂進展特性、ラメラ組織

TiAl基合金の基本組織であるラメラ組織の形態を意図的に変化させた組織を作製し疲労き裂進展特性を調べた．β/γから成るラメラ組織は，α_2/γラメラ組織よりも低いき裂進展閾値を示す一方，き裂進展抵抗に優れる．