在1473 K,30MPa,1.5h的热压条件下直接烧结TiAl金属间化合物和Ti混合粉末,制备了钛基合金(TiAl+Ti)样品,采用XRD、SEM研究了2种不同成分配比对烧结产物相组成及显微结构的影响.结果表明,不同成分配比热压烧结体的显微组织分布相差较大,但相组成基本相同;对于TiAl和Ti体积比7:3的钛基合金样品,Ti粉末中Fe元素易于固溶到Ti2Al和Ti3Al中,析出相主要由TiAl、Ti2Al(Fe)、Ti3Al(Fe)和富Ti相组成;该比例的混合粉末在热压烧结过程中发生了不同程度的扩散反应,最终形成了组织渐变的Ti/Ti3Al(Fe)//Ti2Al(Fe)/TiAl显微结构.
TiAl strengthened Ti-based alloy was prepared by hot-pressed sintering of mixed powders of TiAl and Ti at 1473 K under a pressure of 30 MPa for 1.5 h.The effects of composition ratio on the phase constituent and microstructures of hot-pressed sintering products were subsequently analyzed by XRD and SEM.A large difference exists in the phase distribution for the sintering products with different composition ratios.The feasibility of TiAl reinforced Ti-based alloy is confirmed with TiAl/Ti volume ratio of 7:3.Element Fe is concentrated in Ti2Al and Ti3Al.TiAl,Ti2Al(Fe),Ti3Al(Fe) and Ti-based phases are mainly formed in the sintered product.Different types of diffusion reactions occur within the sintered body during hot-pressed sintering,and finally fine graded microstructures,Ti/Ti3Al(Fe)//Ti2Al(Fe)/TiAl,are formed.
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