中国激光, 2007, 34 (s1): 42, 网络出版: 2009-05-25
钛合金基体上激光熔覆制备钛铝化物基复合涂层组织特征
Microstructure Characteristics of Titanium Aluminides Matrix Composite Coatings Made by Laser Cladding on Titanium Alloy Substrate
激光技术 激光熔覆 钛铝化物涂层 钛合金 laser technique laser cladding titanium aluminide composite coating titanium alloy
摘要
采用含有Ti,Al,Nb,Cr,C元素的混合金属粉末,以激光熔覆的方法在Ti-6Al-4V合金基材上制备了钛铝化物基原位合成碳化物增强复合涂层,分析了涂层的成形、组织组成、成分分布、相结构组成以及显微硬度分布等显微结构特征。所制备的涂层组织细小均匀,其显微结构特征可以描述为:等轴γ-TiAl+层片(γ-TiAl/α2-Ti3Al)+碳化物增强相,其中,等轴的γ-TiAl晶粒尺寸在微米量级,γ-TiAl/α2-Ti3Al 层片间距在500 nm以下,碳化物增强相在涂层内部均匀分布,呈微米级的短棒状形态。
Abstract
Laser cladding of powder mixture containing titanium, aluminum, niobium, chromium, carbon and other elements have been conducted on Ti-6Al-4V substrate in order to synthesize titanium aluminides matrix composite coatings reinforced by in-situ titanium carbide particles. Primary analysis of morphology, microstructure, composition, phase structure and microhardness of the coatings had been performed. The results revealed that the microstructure of coatings obtained here can be characterized as γ-TiAl grains+γ-TiAl/α2-Ti3Al lamellas+carbide particles. The γ-TiAl grains exhibit equivalent diameter of approximately one micron. The even distance of lamellas is below 500 nm. The carbide particles exhibit a stick length of several microns and distribute uniformly throughout the coating.
李晓莉, 刘文今, 钟敏霖, 王三环, 王海龙, 谭永生, 薛晓斌. 钛合金基体上激光熔覆制备钛铝化物基复合涂层组织特征[J]. 中国激光, 2007, 34(s1): 42. 李晓莉, 刘文今, 钟敏霖, 王三环, 王海龙, 谭永生, 薛晓斌. Microstructure Characteristics of Titanium Aluminides Matrix Composite Coatings Made by Laser Cladding on Titanium Alloy Substrate[J]. Chinese Journal of Lasers, 2007, 34(s1): 42.