(中國科學院金屬研究所， 沈陽 110015上海交通大學金屬基復合材料國家重點實驗室， 上海 200030
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摘 要: 由 TiO2-Al-B-CuO 體系制備了原位Al2O3和TiB2粒子增強Al-3.2%Cu和Al-6.0%Cu合金基復合材料。 X射線衍射分析表明， 在兩種復合材料中均有Al2O3和TiB2生成， 沒有發(fā)現(xiàn)Al3Ti相產(chǎn)生。 原位生成的Al2O3和TiB2粒子為尺寸小于2μm的等軸狀粒子， 在Al基體中均勻分布。 室溫拉伸試驗表明兩種Al-Cu合金基原位復合材料具有很高的強度， 并且隨著基體合金中Cu含量的增加復合材料的強度增加。 動態(tài)壓縮試驗表明， 這種Al-Cu合金基原位復合材料的強度對應變速率是不敏感的， 這可由不同應變速率變形后的復合材料基體中位錯密度大致相同來解釋。 高溫壓縮蠕變試驗表明， 兩種復合材料均表現(xiàn)出高的顯態(tài)應力指數(shù)。 隨基體合金中Cu含量的增加復合材料的蠕變抗力明顯提高。
關鍵字: 復合材料 原位 陶瓷粒子 Al2O3 TiB2
（Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, P. R. China
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, P. R. China）
Abstract:In-situ Al2O3 and TiB2 particles reinforced Al-3.2% Cu and Al-6.0%Cu alloy composites were fabricated from TiO2-Al-B-CuO system. X-ray diffraction analyses indicate that Al2O3 and TiB2 are formed in two composites and no Al3Ti appears, insitu formed Al2O3 and TiB2 particles with a size of less than 2μm are equiaxed and well-distributed in Al matrix. Tensile tests at room temperature indicate that two Al-Cu alloy matrix composites exhibit high strength, which increases with increasing Cu content of matrix alloy. Dynamic compression tests demonstrate that the strength of the Al-Cu alloy matrix composites is insensitive to the strain rates, which can be explained by approximately identical dislocation density in the matrix of the composites deformed at different strain rates. Compressive creep tests at high temperature show that both composites exhibit high apparent stress exponents and the creep resistance of the composites is obviously increased with increasing Cu content of the matrix alloy.
Key words: composites in-situ ceramic particle Al2O3 TiB2
