Zn-matrix syntactic foams: Effect of heat treatment on microstructure and compressive properties

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:731

Article

Pan, Liwen^1,2  Yang, Yi¹  Ahsan, Muhammad Usman¹  Dung Dinh Luong¹  Gupta, Nikhil¹  Kumar, Ajay³  Rohatgi, Pradeep K.³ 

[1] NYU, Composite Mat & Mech Lab, Dept Mech & Aerosp Engn, Tandon Sch Engn, Brooklyn, NY 11201 USA

[2] Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China

[3] Univ Wisconsin, Mat Dept, Milwaukee, WI 53201 USA

关键词: ZA8 alloy;    Zinc alloy;    Syntactic foam;    Heat treatment;    Compressive property;    Energy absorption;   

DOI  :  10.1016/j.msea.2018.06.072

来源: Elsevier

【 摘 要 】

Glass microballoon filled ZA8 alloy matrix syntactic foams are studied for the effect of heat treatment on the microstructure, compressive properties and energy absorption capacity. Normalizing and quenching resulted in reduction or dissolution of eutectic (alpha + eta) phase in the matrix alloy. Blocky AI(3)Ni precipitates were observed in the matrix due to the reaction between matrix and the nickel coating of the particles. The average density and porosity of the syntactic foam were around 3 g/cm(3) and 51.5%, respectively. The heat-treated composites had higher yield strength, compressive strength, plateau stress, densification strain and energy absorption capacity than the as-cast composite. The normalized and quenched composites showed the highest compressive strength, plateau stress and energy absorption capacity. In fact, their highest values were 216.8 MPa and 211.9 MPa, 226.9 MPa and 223.4 MPa, and 125.3 MJ/m(3) and 117.7 MJ/m(3), respectively. The improvement in the compressive properties is attributed to composition homogenization of alloying elements and relief of the residual stresses. The superior properties of syntactic foams compared to those of the conventional metal foams suggest their potential applications in marine vessels and submarine structures.

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