Herringbone Structure and Significantly Enhanced Hardness in W-Modified Ti2 AlNb Alloys by Spark Plasma Sintering

Junpeng Yang; Qi Cai; Yongchang Liu; Chong Li; Zongqing Ma; Huijun Li

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자료유형: 학술저널

저자정보: Junpeng Yang (Tianjin University) Qi Cai (Shanghai University) Yongchang Liu (Tianjin University) Chong Li (Tianjin University) Zongqing Ma (Tianjin University) Huijun Li (Tianjin University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.4

발행연도: 2019.1

수록면: 1,000 - 1,007 (8page)

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The W-modifi ed Ti 2 AlNb-based alloys synthesized at 1100 °C by spark plasma sintering were solution treated at 1300 °Cfor 4 h and then aged at 800–1000 °C for 1 h. The phase composition, microstructure evolution, and microhardness of theaged alloys are investigated in this study. A signifi cant enhancement of hardness, ~ 750 HV, is obtained in the alloy aged at900 °C, while that of the one without W addition is only ~ 470 HV. The hardness is also higher than that of common β-Ti andTi–6Al–4V alloys. As the ageing temperature increases, the B2/O structure evolves from B2 + O colonies to Widmannstättenstructure, followed by a “disordering to ordering” procedure. This process also involves the variation of the angle betweenadjacent O phase from 90° to 60°. Specifi cally, a herringbone Widmannstätten B2 + O structure is constructed in the alloysaged in the α 2 + B2 + O phase region, which is related to the diff usion of W and the substitution of W for Nb in the latticeof B2 or O.

#Ti 2 AlNb-based alloy · W addition · Ageing · Widmannstätten structure · Microhardness

참고문헌 (36)

참고문헌 신청

D. Banerjee / 1988 / A new ordered orthorhombic phase in a Ti3Al–Nb alloy / Acta Metall 36:871~882

J. Kumpfert / 2001 / Intermetallic alloys based on orthorhombic titanium aluminide / Adv. Eng. Mater 3:851~864

T. K. Nandy / 1993 / Creep behaviour of an orthorhombic phase in a Ti–Al–Nb alloy / Scripta Mater 28:569~574

H. Song / 2013 / Improving in plasticity of orthorhombic Ti2AlNb-based alloys sheet by high density electropulsing / Trans. Nonferrous Metal. Soc 23:32~37

B. Wu / 2008 / Prediction of the ordering behaviours of the orthorhombic phase based on Ti2AlNb alloys by combining thermodynamic model with ab initio calculation / Intermetallics 16:42~51

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