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熱處理TiAl(W,Si)合金的拉伸性能及裂紋擴(kuò)展
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國家自然科學(xué)基金 (50975060,50901025); “973”項目(2011CB610406); 中國博士后科學(xué)基金 (201104420,20090450840); 黑龍江省科技計劃項目 (GZ09A206); 中央高校人才基金 (HIT.BRET1.2010008)


Tensile Properties and Crack Propagation of Heat Treated TiAl(W, Si) Alloy
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    摘要:

    對鑄態(tài)Ti-46Al-0.5W-0.5Si合金進(jìn)行淬火回火熱處理，獲得了近層片組織和雙態(tài)組織。對兩種不同組織的合金進(jìn)行室溫拉伸試驗，并對試樣斷口和斷口附近的組織進(jìn)行分析，研究了拉伸斷裂機制。結(jié)果表明：雙態(tài)組織比近層片組織具有更好的室溫塑性和抗拉強度。雙態(tài)組織中的裂紋可以繞過較小的γ相顆粒，沿γ相和α2/γ片層團(tuán)的界面擴(kuò)展，也會以穿越層片的方式擴(kuò)展。而近層片組織中的裂紋則是以沿片層和穿越片層的混合方式擴(kuò)展

    Abstract:

    Quenching and tempering heat treatment were carried out to the as-cast Ti-46Al-0.5W-0.5Si alloy, near lamellar and duplex microstructures were obtained. Tensile properties of the heat treated alloy were tested at room temperature. The fracture surface and the cracks adjacent to the fracture zone of the specimens were investigated to analyze the tensile fracture behavior. Results show that the ductility and tensile strength of duplex structure are better than that of near lamellar structure. The cracks in duplex structure can bypass the small γ phase particles, and propagate along the interface of γ phase particles and α2/γ lamellar. The cracks also can propagate in a trans-lamellar mode. The cracks in near lamellar structure propagate in a mixed mode of inter-lamellar and trans-lamellar.

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陳 暉,蘇彥慶,駱良順,李新中,郭景杰,傅恒志.熱處理TiAl(W, Si)合金的拉伸性能及裂紋擴(kuò)展[J].稀有金屬材料與工程,2014,43(1):158~161.[Chen Hui, Su Yanqing, Luo Liangshun, Li Xinzhong, Guo Jingjie, Fu Hengzhi. Tensile Properties and Crack Propagation of Heat Treated TiAl(W, Si) Alloy[J]. Rare Metal Materials and Engineering,2014,43(1):158~161.]
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  • 收稿日期:2012-07-24
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  • 在線發(fā)布日期: 2014-04-16
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