Effect of a Matrix Microstructure on the High Cycle Fatigue Properties of TiB Particulate Reinforced Ti<SUB>3</SUB>Al-Nb Matrix Composites

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  • TiB粒子強化型Ti<SUB>3</SUB>Al-Nb基複合材料の高サイクル疲労強度に及ぼす基質の金属組織の影響
  • TiB粒子強化型Ti3Al-Nb基複合材料の高サイクル疲労強度に及ぼす基質の金属組織の影響
  • TiB リュウシ キョウカガタ Ti3Al-Nbキ フクゴウ ザイリョウ ノ コウサイクル ヒロウ キョウド ニ オヨボス キシツ ノ キンゾク ソシキ ノ エイキョウ

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Abstract

Ti3Al-based alloys, especially alloys containing large amounts of Nb to improve their ductility, are attractive materials for aircraft and automobile parts. However, these alloys do not have good high temperature mechanical properties. In the present study, Ti3Al-Nb alloys reinforced by TiB ceramic particulates were produced using blended elemental (BE) powder metallurgy (P/M). To improve their mechanical properties, the modification of the matrix microstructure was attempted by heat treatment.<BR>Titanium powder, Niobium-Aluminum master alloy powder and TiB2 ceramic powder were used as starting powder materials. Blended powders were cold pressed using mechanical pressing, vacuum sintered at 1823 K and finally hot isostatic pressed (HIP’ed) at 1373 K and 200 MPa for 10.8 ks. During sintering, TiB particulates were in-situ formed and dispersed in the matrix homogeneously. The matrix microstructure of the composite produced by this conventional method showed a colony microstructure with diameters ranging from 5 μm to 20 μm. Modification to a uniform, finer colony microstructure with a diameter of 5 μm was achieved by annealing the composite at 1573 K followed by air-cooling. This resulted in improved high cycle fatigue strength with almost no fatigue data scatter.

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