Properties of TiAl Alloy Prepared by Additive Manufacturing with Laser Coaxial Powder Feeding

Zhanqi, 刘占起 Liu; Guojian, 徐国建 Xu; Ruixin, 马瑞鑫 Ma; Wentao, 郑文涛 Zheng; Fang, 胡方 Hu; Zhengxiang, 杭争翔 Hang

doi:10.3788/cjl201946.0302016

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“…In general, the α 2 phase belongs to the hexagonal structure, and the γ phase belongs to the face-centered crystal structure. The slip system of the hexagonal structure is less than that of the face-centered structure, so the hardness of the α 2 phase is higher than that of the γ phase [27,31,33,34]. The reduction of alloy hardness in this experiment was primarily due to the presence of the α 2 phase.…”

Section: The Mechanical Propertiesmentioning

confidence: 71%

Enhancement of Microstructure and Mechanical Properties of High Nb-TiAl Alloys Prepared Using Laser Additive Manufacturing by Annealing Treatment

Liang,

Liu,

Wang

et al. 2023

Metals

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The microstructure, phase composition, hardness, and tensile properties of the Ti-48Al-2Cr-5Nb alloy have been systematically investigated using laser additive manufacturing technology. Results indicate that both the as-deposited and annealed microstructures contain both the α2 (Ti3Al) and γ (TiAl) phases. As the annealing temperature increased, the structure changed significantly from a large block structure to a fine equiaxed structure and finally to a large lamellar structure. Nevertheless, the amount and distribution of precipitation of α2 phase are obviously different, especially during the annealing at 1260 °C, where the fine α2 phases are evenly distributed on the γ phase matrix. The hardness value of the as-deposited sample is the highest, with a HV value of 484 at the room temperature, while the hardness value of the annealed sample at 1260 °C is the smallest, with a HV value of 344. An annealed sample at 1260 °C exhibits the highest tensile strength and elongation at room temperature, with values of 598 MPa and 2.1%, respectively. These values are increased by 1.15 times and 1.4 times compared to the as-deposited sample (519 MPa, 1.5%).

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Section: The Mechanical Propertiesmentioning

confidence: 71%