On the Supplementation of Magnesium and Usage of Ultrasound Stirring for Fabricating In Situ TiB2/A356 Composites with Improved Mechanical Properties
On the Supplementation of Magnesium and Usage of Ultrasound Stirring for Fabricating In Situ TiB2/A356 Composites with Improved Mechanical Properties
复制标题
镁的补充和超声搅拌原位制备TiB2/A356复合材料力学性能的研究
DOI：
10.1007/s11661-018-4883-x
复制
发表时间：
2018-08
影响因子：
2.8
通讯作者：
Qingyou Han
中科院分区：
文献类型：
--
作者：
Zhiwei Liu;Zhiwu Dong;Xiaole Cheng;Qiaoling Zheng;Jingrui Zhao;Qingyou Han
在机械搅拌的A356合金（Al-7Si-0.3Mg）熔体中加入K2 TiF 6-KBF 4混合盐，通过盐-金属反应制备原位TiB 2/A356复合材料。但在制备过程中，A356合金中Mg元素的流失和TiB 2颗粒在基体中的聚集等问题经常出现。这些问题容易导致复合材料力学性能的下降。在本研究中，定量分析表明，镁元素几乎消耗后的反应，和热力学分析推断，镁的损失是由于镁和混合盐之间的反应。为了制备高强度、高塑性的原位TiB 2/A356复合材料，提出了一种在制备过程中添加Mg元素并采用超声搅拌的方法。超声能使TiB 2颗粒均匀分散在基体中，更有效地细化α-Al晶粒，并使Si相变质。与未处理的A356相比，开发的样品的强度和塑性都得到了显着改善，热膨胀系数失配强化被认为是屈服强度提高的主要贡献者。
Adding mixed K2TiF6-KBF4 salts into mechanical stirred molten A356 alloy (Al-7Si-0.3Mg) provides a simple method to fabricate in situ TiB2/A356 composites via salts-metal reaction. However, some issues, such as the loss of Mg element in A356 alloy and the clustering of TiB2 particles in the matrix, usually occur during the fabricating process. These issues easily result in the degradation of mechanical properties of composites. In this study, a quantitative analysis revealed that the Mg element was almost consumed after the reaction, and a thermodynamic analysis inferred that the loss of Mg resulted from the reaction between Mg and mixed salts. In order to fabricate in situ TiB2/A356 composites with high strength and good ductility, we proposed a developed approach that consisted of supplementing Mg and using ultrasound stirring during the fabricating process. The introduction of ultrasound into the melt could disperse TiB2 particles uniformly in the matrix, leading to more effective refinement of α-Al grains and modification of Si phase. Compared with the untreated A356, both the strength and ductility of the developed sample were improved significantly, and the coefficient of thermal expansion mismatch strengthening was found as the major contributor to the improvement in the yield strength.
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发表时间：
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影响因子：
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