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等離子電火花燒結(jié)溫度對TiAl合金微觀組織和力學(xué)性能的影響
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國家高技術(shù)研究計劃 (2008AA03A233)；國家重點基礎(chǔ)研究發(fā)展計劃 (2011CB605505)


Effect of SPS Temperature on Microstructure and Mechanical Properties of TiAl Alloys
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    摘要:

    以等離子旋轉(zhuǎn)電極球形Ti-45Al-2Cr-2Nb-0.2W預(yù)合金粉末為原料，采用等離子電火花燒結(jié)工藝在1150到1250 ℃范圍內(nèi)制備了高致密度和顯微組織均勻一致的細晶鈦鋁基合金。燒結(jié)溫度為1150 ℃時可獲得均勻組織的α2 + γ雙態(tài)組織，并呈現(xiàn)出燒結(jié)溫度范圍內(nèi)最高的斷裂強度 (1026 MPa) 和室溫延伸率 (1.12%)；燒結(jié)溫度為1250 ℃時可獲得全片層α2 /γ組織，燒結(jié)體的斷裂強度和室溫延伸率分別為953 MPa和0.92%。雙態(tài)組織(DP)的斷裂模式是等軸γ晶內(nèi)的穿晶斷裂和片層晶團內(nèi)的晶間斷裂；而DP組織則為穿片層斷裂、片層間斷裂和臺階撕裂3種模式的復(fù)合模式

    Abstract:

    The spark plasma sintering (SPS) technique was used to consolidate pre-alloyed powder of Ti-45Al-2Cr-2Nb-0.2W produced by plasma rotating electrode processing (PREP). The powder was sintered at temperatures between 1150 and 1250 oC，and the effects of sintering temperature on the microstructure and the mechanical properties were studied. The optimized conditions yield high densities and uniform microstructure. Specimens sintered at 1150 oC are characterized by fine duplex microstructure, leading to superior room temperature mechanical properties with a tensile strength of 1026 MPa and an elongation of 1.12%, while the specimen sintered at 1250 oC are of fully lamellar microstructure with a tensile strength of 953 MPa and an elongation of 0.92%. The main fracture mode in the duplex microstructure is transgranular in the equiaxed γ grains and interlamellar in the lamellar colonies, and for the fully lamellar microstructure the dominant fracture mode is interlamellar, translamellar and stepwise failure.

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楊 鑫,奚正平,劉 詠,湯慧萍,賈文鵬.等離子電火花燒結(jié)溫度對TiAl合金微觀組織和力學(xué)性能的影響[J].稀有金屬材料與工程,2012,41(6):1065~1068.[Yang Xin, Xi Zhengping, Liu Yong, Tang Huiping, Jia Wenpeng. Effect of SPS Temperature on Microstructure and Mechanical Properties of TiAl Alloys[J]. Rare Metal Materials and Engineering,2012,41(6):1065~1068.]
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  • 收稿日期:2011-06-05
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