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李惠.挤压对ZrB2/6063Al复合材料组织及其摩擦磨损特性的影响[J].稀有金属材料与工程(英文),2017,46(10):3017~3022.[lihui.Effects of Extrusion on Microstructure and Friction Wear Resistance in situ ZrB2/6063Al Matrix Composites[J].Rare Metal Materials and Engineering,2017,46(10):3017~3022.]
Effects of Extrusion on Microstructure and Friction Wear Resistance in situ ZrB2/6063Al Matrix Composites
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Received:October 30, 2016  Revised:March 03, 2017
Key words: ZrB2/6063Al composite materials  extrusion  microstructure  friction and wear properties
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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      6063Al- (K2ZrF6+KBF4) was used as the reaction system, in situ ZrB2/6063 aluminum matrix composites were prepared by extrusion. The microstructure changes of the composites before and after extrusion were studied, and the influence of extrusion process on the friction and wear properties of the composites was studied. The results showed that the composite materials were prepared by casting in situ. The grain size of the matrix was 30~50μm, and the ZrB2 particles were regular polygons. After extrusion processing, the grain size of the composite was fine, and the size was 7~14μm, and the particle size was uniform, and the size was 1~3μm, and agglomeration was improved. Because the particle size distribution was more uniform after extrusion, the particle was more round and blunt, which made the surface of the wear scar more smooth, and the difference of the concave and convex of each part was reduced, in the process of loading, the friction coefficient of the main changed in the range of 0.29~0.40, when the load was 12N, the minimum friction coefficient was 0.29 and the minimum friction coefficient compared to the original ingot of composite materials was reduced by 32.4%. So the friction reduction of the composites was greatly improved after extrusion., and the wear volume and wear scar width were decreased due to the increase of the friction reduction,and the wear resistance had also been greatly improved.Through SEM analysis, it can be known that the wear mechanism of the composites was mainly abrasive wear and slight adhesive wear.
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