Decomposition of ZrW2O8 in Al matrix and the influence of heat treatment on ZrW2O8/Al–Si thermal expansion. (February 2015)

• Record Type: Journal Article
• Authors: Wu, Gaohui; Zhou, Chang; Zhang, Qiang; Pei, Risheng
• Is Part Of: Scripta materialia. Volume 96(2015)
• Page Start: 29
• Page End: 32
• Publication Date: 2015-02
• Subjects: Metal matrix material -- Negative thermal expansion -- ZrW2O8 -- Thermal mismatch stress; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2014.10.014
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : Fully dense 64 vol.% ZrW2 O8 /Al–Si was fabricated by squeeze-casting technology. The decomposition of ZrW2 O8 in the Al matrix was studied based on heat-treatment results. The decomposition temperature in the Al matrix is around 410 °C—far below the value for decomposition in air. A large amount of the high-pressure phase, γ-ZrW2 O8, was formed due to the large stress mismatch between ZrW2 O8 and Al–Si matrix. Low heat-treatment temperatures and suitable holding times can effectively limit the amount of γ-ZrW2 O8 that forms as well as stopping the decomposition of ZrW2 O8 .