(1. 燕山大學 材料科學與化學工程學院， 秦皇島 066004；
2. 哈爾濱工業(yè)大學材料科學與工程學院, 哈爾濱 150006)
摘 要: 通過掃描電鏡(SEM)和透射電鏡(TEM)，研究了TiCp/LY12復合材料的顯微組織及反應合成TiC顆粒與Al基體的界面結(jié)構(gòu)。發(fā)現(xiàn)反應合成的TiCp為面心立方，其形狀細小圓整，多為近球形體。TiCp與Al基體的晶體學關(guān)系為：(-2-20)Al∥(0-2-2)TiC及［0-1-1］Al∥［011］TiC 。力學性能測試結(jié)果表明：反應合成TiCp/LY12復合材料的抗拉強度和屈服強度分別比基體LY12鋁合金提高了30%和47%；而延伸率仍能達到4.3%，表現(xiàn)出良好的綜合力學性能。
關(guān)鍵字: TiCp/LY12復合材料； 反應合成； 顯微組織； 界面結(jié)構(gòu)； 力學性能
reaction synthesized TiCp/LY12composites
（1. School of Materials Science and Chemical Engineering,
Yanshan University,Qinhuangdao 066004, P.R.China;
2. School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150006, P.R.China）
Abstract:The microstructure of TiCp/LY12 composites and the interface structure of TiC particles synthesized by reaction and Al matrix were studied by XRD, SEM and TEM, and the TiC particles is of the facecentred cubic fine-grained and conglobulation structure. Interface microstructure of the composites has been observed, which indicates that there exists following crystallization relationship between Al and TiC: (-2-20)Al∥(0-2-2)TiC及［0-1-1］Al∥［011］TiC. The results of mechanical properties tested showed that the ultimate strength and the yield strength of TiCp/LY12 composites are respectively increased by 30% and 47% than that of the LY12 matrix alloy, and the elongation of composites can still reach 4.3%. All of these indicate that the composites are of good mechanical properties.
Key words: TiCp/LY12 composites; microstructures; interface structure; mechanical properties
