日本金属学会誌

J. Japan Inst. Metals, Vol. 63, No. 9 (1999),
pp. 1129-1132

Effect of Heat-Treatment on Residual Strain in L12-(AlMn)3Ti(V) Alloy Powders

Kazuo Kasahara1, Kenki Hashimoto1,Takashi Kimura1 and Yasuhisa Yamamoto2

1National Research Institute for Metals, Tsukuba 305-0047
2Department of Metallurgical Engineering, Faculty of Engineering, Chiba Institute of Technology, Narashino 275-0016

Abstract:

To evaluate the effect of heat-treatment and vanadium addition on the microstructure and the room-temperature ductility of the L12-type (AlMn)3Ti titanium trialuminides alloy, the alloys with addition of vanadium up to 6 mol% were homogenized in a temperature range of 1450{~}1530 K for a time less than 259.2 ks. The microstructure characterizations were performed by using the laser optical microscopy, scanning electron microscopy and X-ray diffraction. The residual strain which was induced during the milling of the L12 single-phase alloys into powder specimens was determined form X-ray diffraction peak profiles. All of the alloys exhibit a single-phase microstructure containing only the L12 phase, irrespective of the homogenization condition. These alloys also exhibit a small amount (0.1{~}1.0% in area) of porosity which decreased with increasing vanadium content and the amount of porosity was independent of the homogenization temperature. A relatively large residual strain was obtained from the alloy with higher vanadium content, while the residual strain has shown a small change depending on the homogenization temperature. These results suggest that the effect of heat-treatment on microstructure and room-temperature ductility is not so remarkable as those of the change of alloy compositon.


(Received April 26, 1999; In Final Form June 23, 1999)

Keywords:

intermetallic compound, L12-type titanium trialumidies, heat-treatment, lattice constant, residual strain


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