Synthesis of Ultrafine Crystal/Nanocrystalline TiAl-based Alloy by in Situ Sintering

Chen, Hua; Zhao, Huimin; Zou, Yang

doi:10.1016/s1875-5372(16)30026-1

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2017

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“…In contrast, such studies on the PM–TiAl alloy do not require any such strenuous thermomechanical processes. Methods involving net shape processes lead to fine and homogenous equiaxed microstructure [17,18].…”

Section: Introductionmentioning

confidence: 99%

High-temperature deformation mechanism of γ-TiAl-based alloy with ultrafine grains

Gong

Zhao

Chen

2017

Materials Science and Technology

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Equiaxed ultrafine duplex alloys γ-TiAl and α2-Ti3Al are prepared by high-energy milling and hot pressing sintering. Microstructures presenting in the mixed and sintered powders are studied by scanning electron microscopy. Structural characteristics are investigated by high-resolution electron microscopy before and after compression at 1100–1200°C. The data reveal grain sizes of 300–500 and ∼100 nm for sintered γ-TiAl and α2-Ti3Al alloys, respectively. High deformation temperatures and low strain rates lead to low peak flow stress, and at such conditions the α2/γ and α2/α2 interfaces are prone to forming dislocation structure. The studies also reveal the presence of large-angle grain boundaries for the [Formula: see text] and (0002)α2/(0002)α2 interfaces.

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Section: Introductionmentioning

confidence: 99%