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Y, Nb對快速凝固TiAl合金組織和性能的影響
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國家自然科學(xué)基金 (50674037)


Effects of Y and Nb on the Microstructure and Mechanical Properties of Rapidly Solidified TiAl Alloys
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    摘要:

    研究了元素Y和Nb對用熔體快淬法制備的TiAl基快速凝固合金組織及性能的影響。發(fā)現(xiàn)添加Y的快速凝固TiAl合金主要為等軸晶，主要組成相為α2和少量的γ相。隨著Y含量的增加，γ相的含量增加，快速凝固TiAl合金的組織逐漸細(xì)化。不同Nb含量的快速凝固TiAl合金的組織為塊狀結(jié)構(gòu)和層片狀結(jié)構(gòu)，主要由γ和α2兩相組成，層片間距顯著細(xì)化，為15~17 nm。快速凝固TiAl合金的硬度比其鑄態(tài)合金顯著提高

    Abstract:

    The effects of Y and Nb on the microstructure and mechanical properties of rapidly solidified TiAl alloys were investigated. Results show that the rapidly solidified TiAl alloys with various Y contents are of equiaxed microstructure, and composed mainly of α2 and a few amount of γ phase. With Y content increasing, the volume fraction of γ phase is increased and the microstructure of the TiAl alloys is gradually refined. The alloys with various Nb contents show lamellar structure with reduced interlamellar spacings of 15-17 nm and massive structure. γ and α2 are also the two main phases for rapidly solidified TiAl alloys with various Nb addition. The hardness of rapidly solidified TiAl alloys is higher than that of the conventionally cast TiAl alloys

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柴麗華,陳玉勇,劉志光. Y, Nb對快速凝固TiAl合金組織和性能的影響[J].稀有金屬材料與工程,2011,40(11):1976~1980.[Chai Lihua, Chen Yuyong, Liu Zhiguang. Effects of Y and Nb on the Microstructure and Mechanical Properties of Rapidly Solidified TiAl Alloys[J]. Rare Metal Materials and Engineering,2011,40(11):1976~1980.]
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  • 收稿日期:2010-11-22
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