(北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083)
摘 要: 850 ℃下在真空熔煉爐中通過液態(tài)鋁與無定形硼粉之間的化學(xué)反應(yīng)，原位合成AlB2-Al復(fù)合材料。研究該鋁基復(fù)合材料經(jīng)過熱軋和固溶處理后顯微組織與力學(xué)性能的變化。分別利用掃描電鏡(SEM)、光學(xué)電鏡和X射線衍射儀(XRD)對(duì)合成復(fù)合材料的顯微組織和物相組成進(jìn)行分析，并采用室溫下的拉伸實(shí)驗(yàn)確定AlB2-Al復(fù)合材料的力學(xué)性能。結(jié)果表明：由于在鋁基體中生成了高縱橫比的AlB2薄片，復(fù)合材料的硬度與抗拉強(qiáng)度明顯高于純鋁基體的，但其塑性降低。經(jīng)固溶處理后，AlB2-Al復(fù)合材料的伸長(zhǎng)率可達(dá)26%以上。
關(guān)鍵字: AlB2-Al；原位復(fù)合材料；熱軋；固溶處理；力學(xué)性能
（School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:In-situ AlB2-Al composite was synthesized by chemical reaction between liquid aluminum and amorphous boron powder at 850 ℃ in vacuum melting furnace. The changes of microstructure and mechanical properties of this aluminum matrix composite after hot-rolling and solution treatment were studied. Scanning electron microscopy (SEM), optical microscopy and X-ray diffraction (XRD) were used to investigate the morphology and phase composition of the composite. The mechanical properties of AlB2-Al composite were determined by the tensile test at room temperature. The results show that the AlB2 flakes with high aspect ratio form in Al matrix, therefore, the micro-hardness and tensile strength of the composite are significantly higher than those of pure aluminum, but the ductility of matrix is reduced. And the elongations of composites can reach more than 26% after solution treatment.
Key words: AlB2-Al; in-situ composite; hot-rolling; solution treatment; mechanical property
