0
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.

1

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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 6

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

Grahic Jump Location
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

Grahic Jump Location
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

Grahic Jump Location
Figure 3

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

Grahic Jump Location
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

Grahic Jump Location
Figure 1

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

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In