论文部分内容阅读
研究不同Bi含量的添加对Al-15Mg2Si原位金属基复合材料组织与干磨擦磨损性能的影响。结果表明,Bi的适量添加对复合材料中的初生和共晶Mg2Si相具有明显的变质效果。含Bi复合材料的磨损率和摩擦系数都小于无Bi复合材料的。Bi改变了复合材料的磨损机理,1%Bi的添加使其从磨粒磨损、粘着磨损和疲劳磨损转变为微弱磨粒磨损和粘着磨损,4%Bi的添加有效地抑制了摩擦表面初生Mg2Si颗粒裂纹的产生,避免了粘着磨损和疲劳磨损,使复合材料的磨损成为单一的微弱磨粒磨损。含Bi复合材料耐磨性能的改善是Bi对Mg2Si相的变质作用和Bi颗粒自润滑作用的综合结果。
The effects of different Bi content on microstructure and dry friction and wear properties of Al-15Mg2Si in-situ metal matrix composites were studied. The results show that the proper addition of Bi has a significant effect on the modification of the primary and eutectic Mg2Si phases in the composites. The wear rate and friction coefficient of Bi-containing composites are less than those of Bi-free composites. Bi changed the wear mechanism of the composites. The addition of 1% Bi changed it from abrasive wear, adhesive wear and fatigue wear to weak abrasive wear and adhesive wear. The addition of 4% Bi effectively restrained the frictional surface primary Mg2Si particles Crack generation, to avoid the adhesive wear and fatigue wear, the composite wear and tear as a single weak abrasive wear. The improvement of the wear resistance of the Bi-containing composites is the result of Bi’s modification of the Mg2Si phase and the self-lubricating effect of Bi particles.