冷却速率对含TiB2的TiAl合金凝固组织和力学性能的影响
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA（2021）
Abstract
通过熔模精密铸造制备不同厚度的Ti-48Al-2Cr-2Nb和Ti-48Al-2Cr-2Nb-0.25TiB2合金铸板,研究冷却速率和TiB2添加对合金凝固组织和力学性能的影响.实验结果表明,当凝固速率从37增加至2×102 K/s时,合金的凝固路径并未发生改变.基体合金的晶粒从650细化至300μm,Ti-48Al-2Cr-2Nb-TiB2合金的晶粒则从550细化至80μm.随着冷却速率从37提高至2×102 K/s,基体合金的片层间距从360减小至30 nm,TiB2添加对片层间距的影响较小.在中等冷却速率下(69 K/s),Ti-48Al-2Cr-2Nb-TiB2合金铸板表现出最优的力学性能,显微硬度达到HV 550,极限抗拉强度达到570 MPa,这主要归因于晶粒尺寸、片层间距的细化和细小TiB2颗粒的作用.从冷却速率、成分过冷和添加硼化物等角度对显微组织演化过程进行详细讨论.
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Key words
titanium aluminides, TiB2, cooling rate, microstructure evolution, mechanical properties
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