Effect of Heat-Treatment on Residual Strain in L1<SUB>2</SUB>-(AlMn)<SUB>3</SUB>Ti(V) Alloy Powders

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  • L1<SUB>2</SUB>型(AlMn)<SUB>3</SUB>Ti(V)合金の粉末化試料に残留するひずみ量と均質化条件
  • L12型(AlMn)3Ti(V)合金の粉末化試料に残留するひずみ量と均質化条件
  • L12ガタ AlMn 3Ti V ゴウキン ノ フンマツカ シリョウ ニ ザンリュウ スル ヒズミ リョウ ト キンシツカ ジョウケン

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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.

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