Research Papers

Phase Evolution in Laser Rapid Forming of Compositionally Graded Ti–Ni Alloys

[+] Author and Article Information
X. Lin1

Department of Industrial and Systems Engineering, Advanced Manufacturing Technology Research Centre, Hong Kong Polytechnic University, Hung Hom, Hong Kongxlin@nwpu.edu.cn

T. M. Yue, H. O. Yang

Department of Industrial and Systems Engineering, Advanced Manufacturing Technology Research Centre, Hong Kong Polytechnic University, Hung Hom, Hong Kong

W. D. Huang

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, P.R.C.


Corresponding author. Present address: Northwestern Polytechnical University, Xi’an, China.

J. Eng. Mater. Technol 131(4), 041002 (Sep 03, 2009) (5 pages) doi:10.1115/1.3184028 History: Received April 06, 2008; Revised June 17, 2009; Published September 03, 2009

A graded binary titanium-nickel alloy with a compositional gradient, from elemental Ti to Ti23.2at.% Ni, has been successfully deposited using laser rapid forming. A metallurgical study of the phase evolution along the compositional gradient showed that a series of phase evolutions αα+βα+β+Ti2Niβ/B2+Ti2Ni have occurred. Phase formation and microstructure evolution along the compositional gradient was analyzed by Scheil–Gulliver and eutectic growth models. In particular, the morphology of the β/B2+Ti2Ni anomalous and coupled eutectic is discussed in detail.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

The compositional gradient of the LRF Ti–Ni graded material (measured along the vertical direction of the graded deposit)

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Figure 2

Phase diagram of the Ti–Ni system corresponding to the composition range (dark point) shown in Fig. 1 after Ref. 13; the figure also shows the extension of possible phase fields and the T0 curves of the phases

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Figure 3

The XRD patterns of the graded material measured along the compositions gradient

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Figure 4

Backscattered SEM images showing the microstructure along the compositional gradient: (a) Ti–0.6 at. % Ni, (b) Ti–1.9 at. % Ni, (c) Ti–2.5 at. % Ni, (d) Ti–6 at. % Ni, (e) Ti–8.6 at. % Ni, (f) Ti–13 at. % Ni, (g) Ti–15.9 at. % Ni, (h) Ti–15.9 at. % Ni, (i) Ti–21.1 at. % Ni, and (j) Ti–22.1 at. % Ni

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Figure 5

Liquid solute concentration as a function of the solid fraction under Scheil solidification mode for the alloy with the different compositions along the graded deposit

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Figure 6

The relation between eutectic interface temperature and growth velocity for β-Ti+Ti2Ni eutectic



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