Decomposition of ZrW2O8 in Al matrix and the influence of heat treatment on ZrW2O8/Al-Si thermal expansion

作者：Wu Gaohui; Zhou Chang; Zhang Qiang^*; Pei Risheng

来源：Scripta Materialia, 2015, 96: 29-32.

DOI：10.1016/j.scriptamat.2014.10.014

• Metal matrix material
• Negative thermal expansion
• ZrW2O8
• Thermal mismatch stress

Fully dense 64 vol.% ZrW2O8/Al-Si was fabricated by squeeze-casting technology. The decomposition of ZrW2O8 in the Al matrix was studied based on heat-treatment results. The decomposition temperature in the Al matrix is around 410 degrees C far below the value for decomposition in air. A large amount of the high-pressure phase, gamma-ZrW2O8, was formed due to the large stress mismatch between ZrW2O8 and Al Si matrix. Low heat-treatment temperatures and suitable holding times can effectively limit the amount of gamma-ZrW2O8 that forms as well as stopping the decomposition of ZrW2O8.

• 出版日期2015-2
• 单位哈尔滨工业大学