Mechanical properties of in-situ TiB₂/A356 composites

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• 作者：Mingliang Wang ; Dong Chen ; Zhe Chen ; Yi Wu ; Feifei Wang ; Naiheng Ma ; Haowei Wang
• 关键词：Metal matrix composites ; Particulate reinforced composites ; A356 alloy ; Particle cluster ; Strengthening mechanism
• 刊名：Materials Science and Engineering: A
• 出版年：10 January, 2014
• 年：2014
• 卷：590
• 期：Complete
• 页码：246-254
• 全文大小：2139 K

文摘

In the present work, the in-situ TiB₂/A356 composites were successful synthesized through the salt-metal reaction route. The research was undertaken to study the mechanical properties of the A356 alloy reinforced with TiB₂ particles at both as-cast state and T6 state. In two cases, the results showed the Young's modulus of composites was increased with increasing the TiB₂ content up to 8.37% in volume fraction. The dependence of Young's modulus on the TiB₂ particle content can be well rationalized by the Tsai-Halpin equation. Similarly, the yield strength of composites was improved with the increase of TiB₂ particle content at both states. Using the modified shear lag model, the calculated yield strength can be well fitted with the experimental values at as-cast state, but not at T6 state. Further, a phenomenological model was proposed by accounting for TiB₂ particulate strengthening mechanisms and microstructural features related coefficient in TiB₂/A356 composites. The predictions of yield strength using this model are in good agreement with experimental data from both as-cast state and T6 state in this work and also reported in the literatures about in-situ TiB₂/Al alloy composites.