In situ CrB₂ and its effect on the mechanical properties of A390 alloy

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• 作者：Xiaoli Cui ; Yuying Wu ; Tong Gao ; Chong Li ; Jinfeng Nie ; Xiangfa Liu
• 关键词：In situ CrB2 ; Metal matrix composites (MMCs) ; Mechanical properties ; Microstructure
• 刊名：Materials Characterization
• 出版年：December, 2013
• 年：2013
• 卷：86
• 期：Complete
• 页码：296-302
• 全文大小：1994 K

文摘

In this work, a series of CrB₂/A390 composite alloys have been prepared and analyzed by a field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). Firstly, in situ CrB₂ has been prepared by reducing reaction that occurred in Al melt: AlB₂ + [Cr] 鈫?#xA0;Al + CrB₂. The CrB₂ particles exhibit regular hexagonal platelet morphology and distribute uniformly in the Al matrix. Then, A390 alloys with different CrB₂ additions have been prepared. With the addition of CrB₂, the size of primary Si can be reduced remarkably. The generation of CrB₂ particles and their diffuse distribution can improve the mechanical properties of A390 alloy obviously. The mechanical properties of the base alloy, including ultimate tensile strength at 25 掳C (UTS_25 掳C), the coefficient of thermal expansion (CTE) and wear resistance have been studied and the composite alloy with 3 wt.% CrB₂ particle addition showed the best performance.