Crystallography of grain refinement in cast zinc-copper alloys

Liu, Zhilin, Qiu, Dong, Wang, Feng, Taylor, John A. and Zhang, Mingxing (2015) Crystallography of grain refinement in cast zinc-copper alloys. Journal of Applied Crystallography, 48 890-900. doi:10.1107/S1600576715008936

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Author Liu, Zhilin
Qiu, Dong
Wang, Feng
Taylor, John A.
Zhang, Mingxing
Title Crystallography of grain refinement in cast zinc-copper alloys
Journal name Journal of Applied Crystallography   Check publisher's open access policy
ISSN 1600-5767
0021-8898
Publication date 2015
Sub-type Article (original research)
DOI 10.1107/S1600576715008936
Open Access Status File (Publisher version)
Volume 48
Start page 890
End page 900
Total pages 11
Place of publication Malden, MA, United States
Publisher International Union of Crystallography
Collection year 2016
Language eng
Formatted abstract
Adding the peritectic forming element Cu effectively reduced the average grain size of cast Zn by over 85%. At a specified cast condition, the smallest grain size was obtained at 2 wt% Cu addition. A further increase in Cu content led to grain coarsening in the cast Zn-Cu alloys. Although the solute effect of Cu was predominately responsible for the grain refinement through restriction of the grain growth, it was found that the variation of grain size is also closely related to the formation of the pro-peritectic phase, ε-CuZn4. Crystallographic calculations using the edge-to-edge matching model showed low interatomic misfit and interplanar mismatch between Zn and the ε-CuZn4 phase. In addition, a reproducible h.c.p.-h.c.p. (h.c.p. denotes hexagonal close-packed) orientation relationship between Zn and the ε-CuZn4 particles (located within the Zn grain centres) was also experimentally determined using the electron backscattered diffraction method. This indicated the high potency of the pro-peritectic ε-CuZn4 particles as effective heterogeneous nucleation sites for n-Zn, which further refined the Zn grains. However, when the Cu content was over 2.0 wt%, formation of large ε-CuZn4 particles resulted in grain coarsening of the cast alloys.
Keyword Edge-to-edge matching
Grain refinement
Heterogeneous nucleation
Zn-Cu alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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