原位反應(yīng)浸滲法制備(B4Cp+Tip)混雜增強(qiáng)Mg及AZ91D復(fù)合材料及其阻尼性能

原位反應(yīng)浸滲法制備(B4Cp+Tip)混雜增強(qiáng)Mg及AZ91D復(fù)合材料及其阻尼性能DAMPING CAPACITIES OF (B4Cp+Tip) HYBRID REINFORCED Mg AND AZ91D COMPOSITES PROCESSED BY IN SITU REACTIVE INFILTRATION TECHNIQUE

針對(duì)B4C/Ti體系潤(rùn)濕性較差導(dǎo)致復(fù)合效率低下的問題，加入高熔點(diǎn)、不互熔金屬Ti顆粒來(lái)改善該體系的潤(rùn)濕性，并成功利用原位反應(yīng)浸滲法實(shí)現(xiàn)(B4C+Ti)/Mg和(B4C+Ti)/AZ91D復(fù)合材料的高效、低成本制備。對(duì)制備的(B4C+Ti)/Mg和(B4C+Ti)/AZ91D復(fù)合材料的微觀組織、生成物相以及室溫和高溫阻尼性能進(jìn)行了分析與表征。結(jié)果表明，制備溫度對(duì)復(fù)合材料的微觀組織和生成物相有較大的影響；隨著制備溫度的升高，原始顆粒之間的原位反應(yīng)程度逐漸趨于完全，(B4C+Ti)/AZ91D復(fù)合材料的微觀組織逐漸由顆粒增強(qiáng)結(jié)構(gòu)轉(zhuǎn)變?yōu)榫W(wǎng)絡(luò)互穿結(jié)構(gòu)。(B4C+Ti)/Mg和(B4C+Ti)/AZ91D復(fù)合材料的室溫和高溫阻尼性能分別隨著應(yīng)變振幅和溫度的升高而增強(qiáng)，主要作用機(jī)制為位錯(cuò)阻尼和界面阻尼機(jī)制。

In situ reactive infiltration is a relatively new processing method to prepare metal matrix composites, which combines the advantages of in situ reaction synthesis and pressureless infiltration, and it has received increasing attention because of its cost-effectiveness, simplicity and high-efficiency, and near-net shaping capability. And by tailoring the relative density of preform, magnesium matrix composites with a high volume fraction of ceramic reinforcement can be obtained. In view of the poor wettability of B4C/Ti system leading to low efficiency of composite, Ti particulates with high melting point and immiscible with magnesium was added. And (B4C+Ti)/Mg and (B4C+Ti)/AZ91D composites have been prepared successfully by in situ reactive infiltration method with high efficiency and low cost. Microstructure, phase composition and damping capacities of the as-fabricated composites were characterized and analyzed. Results showed that with increasing the preparation temperatures, the reaction between the starting materials is more complete, and the microstructure of (B4C+Ti)/AZ91D composites tends to be interpenetrating networks from particle reinforced structure. The strain-dependent and temperature-dependent damping capacities of (B4C+Ti)/Mg and (B4C+Ti)/AZ91D composites improve gradually with the increase of strain amplitude and temperature respectively, and the dominant damping mechanisms are dislocation damping and interface damping.

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