The development of adscititious particle reinforced aluminium matrix composites and al matrix in - situ composites reinforced by reaction synthesis " reinforcement phase are reviewed at first . and the papers point out the difficulties and problems on the study of al matrix composites at present 本文首先回顾了外加颗粒增强铝基复合材料和反应合成强化物增强铝基原位复合材料的研究进展，指出当前铝基复合材料研究中存在的问题。
Under a constant applied load and sliding speed , the wear rate of cu - nanosized tib2 in - situ composites was increased with increasing the electric current . the predominant electric wear mechanisms of the cu - nanosized tib2 in - situ composites are abrasive wear and arc erosion 在一定载荷和滑动速度下，随电流的增加， cu -纳米tib2原位复合材料的磨损率增加， cu -纳米tib2原位复合材料的电接触滑动磨损机制主要为磨粒磨损和电侵蚀磨损。
Used solid - liquid reaction synthesis technology and stirring casting and metal mold chilling processing , al3fe particles and al3fe + al2o3 particles reinforced pure al matrix in - situ composites are fabricated . the metallography analysis shows that the intermetallic al3fe exhibits two kinds of crystalline state - primary crystal al3fe and eutectic crystal al3fe - in al + fe reaction synthetical al matrix in - situ composites 利用固-液反应合成技术和搅拌技术，并结合金属型激冷铸造工艺，制备出了al _ 3fe粒子、 al _ 3fe粒子+ al _ 2o _ 3微粒强化的纯al基原位复合材料。
Copper - nanosized tibi composites were prepared by in - situ process . the microstructure , mechanical and electrical properties , and dry sliding wear behavior and electric sliding wear of cu - nanosized tib _ 2 in - situ composites was investigated ; mostly task as follows : the thermodynamic data for the reactions between b and ti in the molten liquid of copper were analyzed , the copper matrix composites reinforced by in - situ tibi nanoparticles were prepared by reactions of 8263 , carbon and titanium in copper - titanium melt , and copper - titanium , copper - boron in alloy melt , respectively , which controlled the reaction temperature , reaction time and solidification process . the rnicrostructure and mechanical and electrical properties of the in - situ composites were investigated by using optics microscope , tem and xrd 本文采用原位反应法制备了cu -纳米tib _ 2原位复合材料，在此基础上分析了原位复合材料的微结构，进行了干滑动摩擦磨损和电接触滑动磨损实验，完成的主要工作如下：从热力学的角度出发，分析了陶瓷tib _ 2颗粒在铜基体中原位生成的热力学条件，并用电解铜、工业纯钛、 b _ 2o _ 3 、 c (还原剂)以及cu - ti 、 cu - b等合金为原料，通过控制适当的反应温度、反应时间和快速凝固等工艺手段，制备了cu -纳米tib2原位复合材料。
Owing to the interfacial cracking which occurs under higher applied load conditions , the composite with high content of tib _ 2 phase exhibited a transition from mild wear to severe wear over the applied load range from 10 n to 80 n . under moderate applied load , increasing the sliding speed caused a decrease in wear rate and friction coefficient of the in - situ composites because the formation of a protective oxide film occurred on the sliding surface and the hardness of the subsurface layer was maintained due to reinforcement of tib2 nanoparticles in the cu matrix 随着载荷的增加， cu -纳米tib2原位复合材料的磨损率和摩擦系数增加；由于在较高载荷下发生表面开裂，高含量的tib2相增强原位复合材料发生了由轻度磨损向严重磨损形式的转化。在中等载荷下由于表面保护性氧化膜的形成和基体中纳米tib2相的存在使复合材料具有良好的抗软化能力， cu -纳米tib2原位复合材料的磨损率和摩擦系数随着滑动速度的增加而下降。
The new phenomena , never previously reported in the references , of the pa66 phase morphology in the pp / pa66 in - situ composites varying with pa66 contents ( cd ) are revealed as follows : the diameter or width of pa66 fibers has dispersity , which becomes smaller first and then larger lately with cd . additionally , the number of pa66 unfibrillized paticles increases with cd 发现和分析讨论了pp仔a66原位复合材料中pa66相形态随其含量ud ）的变化中出现的未见文献报导的新现象： pa66纤维直径或宽度存在分散性，此分散性随cd先变小后变大，另外pa66未成纤粒子数随cd而趋增多。
