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,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.]
挤压对ZrB2/6063Al复合材料组织及其摩擦磨损特性的影响
投稿时间:2016-10-30  修订日期:2017-03-03
中文关键词:  rB2/6063Al复合材料  挤压  微观组织  摩擦磨损性能
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      本文以6063Al-(K2ZrF6+KBF4)为反应体系,原位制备ZrB2/6063铝基复合材料,采用挤压对复合材料进行塑性加工。研究了挤压前后复合材料的微观组织变化,以及挤压工艺对复合材料摩擦磨损性能的影响。结果表明:铸态原位内生制得复合材料,基体晶粒大小为30~50μm,ZrB2颗粒呈规则的多边形,团聚现象严重。经过挤压加工之后,复合材料晶粒细化,大小为7~14μm,增强颗粒呈有圆边的多边形,分布均匀,尺寸为1~3μm,团聚改善。由于挤压后增强颗粒分布更加均匀,颗粒更加圆钝,使得摩擦后磨痕表面更加平整,各部分凹凸差异减小,磨痕粗糙度及摩擦系数减小,摩擦系数随着载荷的增大而减小,摩擦系数主要在0.29~0.40之间变化,载荷为12N时摩擦系数最小为0.29,相比于原始铸锭复合材料的最小摩擦系数减小了32.4%,因此挤压后复合材料的减摩性有了很大的提高,由于减摩性的提高,复合材料磨损后的磨损体积和磨损宽度军舰小,耐磨性也得到了很大的提高。通过SEM分析复合材料的磨损机制是以磨粒磨损为主,轻微粘着磨损为辅。
Effects of Extrusion on Microstructure and Friction Wear Resistance in situ ZrB2/6063Al Matrix Composites
英文关键词:ZrB2/6063Al composite materials  extrusion  microstructure  friction and wear properties
英文摘要:
      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.
作者单位E-mail
李惠 江苏科技大学 lihuiwind@163.com 
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