Microstructure evolution of the rapidly solidified alloy powders and composite powders

Q. Yang; Y.T. Liu; J. Liu; L. Wang; Z. Chen; M.L. Wang; S.Y. Zhong; Y. Wu; H.W. Wang

Materials & Design (Nov 2019)

Microstructure evolution of the rapidly solidified alloy powders and composite powders

Q. Yang,
Y.T. Liu,
J. Liu,
L. Wang,
Z. Chen,
M.L. Wang,
S.Y. Zhong,
Y. Wu,
H.W. Wang

Affiliations

Q. Yang: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China
Y.T. Liu: Beijing Institute of structure and environment Engineering, Beijing 100076, PR China
J. Liu: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China
L. Wang: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China
Z. Chen: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China; Corresponding authors.
M.L. Wang: School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China
S.Y. Zhong: School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; Corresponding authors.
Y. Wu: School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China
H.W. Wang: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China

Journal volume & issue: Vol. 182

Abstract

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In the present work, the size-dependent microstructure evolution of the Al-Zn-Mg-Cu alloy powders and the TiB2/Al-Zn-Mg-Cu composite powders are studied experimentally and theoretically. Several different types of microstructures are formed within alloy powders as a function of powder size but just one type is formed within the composite powders. The transitions in microstructure within a powder such as planar interface breaking down into cellular microstructure are also observed. The occurrence of the planar interface is analyzed in terms of critical undercooling and critical cooling rate, and the breaking down of planar interface is correlated with the thermal history of the droplets modeled by Newtonian thermokinetics and interface velocity modeled by BCT models. In the composite powders, the location of TiB2 particles depends on the entrapment/pushing by the solid/liquid interface. The disturbance of temperature field and multiple nucleation sites due to the introduction of TiB2 particles contribute to the variation in the microstructure of alloy powders and composite powders. Keywords: Rapid solidification, Solute trapping, Cellular/dendrite, Particles

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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