TiB2對γ-TiAl基合金粉末放電等離子燒結行為的影響

TiB2對γ-TiAl基合金粉末放電等離子燒結行為的影響Effect of TiB2 on spark plasma sintering behavior of γ-TiAl based alloy powders

采用機械球磨方法制備了含TiB2的γ-TiAl基合金粉末，并利用放電等離子燒結(SPS)技術制備了其合金粉末燒結體。結合X射線衍射(XRD)和掃描電子顯微鏡(SEM)分析方法對球磨合金粉末的形貌、相組成及其SPS燒結體的顯微組織結構進行觀察，分析其致密化及微觀組織演化過程，并利用萬用拉伸試驗機對燒結體的室溫力學性能進行測試。結果表明：球磨處理后γ-TiAl基合金粉末呈現(xiàn)近球狀和不規(guī)則形狀粉末；粉末的相組成以α2相為主，同時含有一定量的γ相和少量的B2相。提高燒結溫度可促進γ-TiAl基合金粉末SPS燒結致密化過程，適量的TiB2的添加也能夠有效降低合金粉末SPS快速致密化的起始溫度。當TiB2添加量為0.2%(質量分數(shù))時，合金粉末在1100 ℃、40 MPa、10 min條件下燒結，其顯微組織呈現(xiàn)出由γ晶、α2晶和α2/γ片層結構組成的混合組織結構，各相分布均勻且晶粒細小，其所對應的室溫抗拉強度也最高。

γ-TiAl based alloy powders containing TiB2 were prepared by mechanical ball milling method. The sintered alloys were fabricated by spark plasma sintering (SPS) technique. By combining X-ray diffractometry (XRD) and scanning electron microscopy (SEM), the morphology and phase constitution of as-milled alloy powders as well as the microstructures of SPS sintered alloys were observed. The densification process and microstructural evolution of the alloy powders during SPS were analyzed. The mechanical properties of the sintered alloys at room temperature were tested by a universal tensile tester. The results show that the as-milled γ-TiAl based alloy powders exhibit spherical-like shape and irregular shape. The phase composition of the powders consists of main α2 phase, a certain amount of γ phase and a few B2 phase. The SPS densification course of the γ-TiAl based alloy powders can be promoted by elevating the sintering temperature. The addition of TiB2 with a suitable amount to γ-TiAl based alloy powders can also effectively reduce the onset temperature of rapid densification. The microstructure of γ-TiAl based alloy powders with TiB2 addition of 0.2% (mass fraction) presents a mixed structure composed of γ grains, α2 grains and α2/γ lamellae when sintered at the condition of 1100 ℃, 40 MPa and 10 min. The phases are well-distributed and the grains are refined, leading to its higher tensile strength at room temperature.

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