J. Japan Inst. Metals, Vol. 58, No. 5 (1994),
pp. 564-570

Effect of Nitrogen Addition on the Microstructure and Mechanical Properties of Cast γ Titanium Aluminide Alloys

Isamu Yuki¹, Norihiro Amano¹, Minoru Uozumi¹,Haruyuki Inui² and Masaharu Yamaguchi²

Abstract:

Ti-(30{~}38 mass%)Al-(0{~}1 mass%)N alloys prepared by a precision casting method were investigated.
The addition of nitrogen was found to be effective in refining TiAl/Ti₃Al lamellar grains. Two-phase nitride particles composed of TiN as a core and Ti₂AlN as an outer shell, together with fine precipitates of Ti₃AlN, were identified in the present alloys containing nitrogen. The room-temperature ductility and strength increased with increasing nitrigen content up to about 0.3 mass%N, while they were decreased by further addition of nitrogen. The improvement in the room-temperature mechanical properties is mainly caused by grain refining and precipitation hardening.

(Received June 20, 1993)

Keywords:

titanium aluminide, nitrogen, nitride, microstructure, grain size, mechanical properties, tensile strength, Vickers hardness

PDF (Free)

Table of Contents

Please do not copy without permission.