| Title |
Wear Properties of Al-Mg-Si Alloy Matrix-10vol.% Al2O3 Composite |
| Authors |
김동현(Dong Hyun Kim); 맹덕영(Duck Young Maeng); 이종현(Jong Hyeon Lee); 송재숙(Jae Sook Song); 홍순익(Sun Ig Hong); 원창환(Chang Whan Won) |
| Keywords |
Composite; Microstructure; Shear modulus; Wear resistance; Aging; Orientation; Fragment; Plastic flow |
| Abstract |
Wear properties of 6061 Al-Al2O3 particulate composites were investigated and correlated with the microstructure. The peak-aged composite was more wear-resistant than the underaged composite and the plane perpendicular to the extrusion direction was more wear-resistant than that parallel to the extrusion direction. The difference of the wear resistance between two different orientations was observed to be greater than that between underaged and peak-aged matrix microstructure, suggesting that preferential orientation of particulates has a greater effect on the wear resistance than the change of the matrix microstructure. The difference of wear properties between two different orientations can be explained by the effect of preferentially orientated reinforcing particles on the shear modulus and shear deformation. The mechanically mixed layer with fine Al2O3 fragments was observed at the sliding speed of 1.14 m/s. When the sliding speed was increased to 362 m/s. the presence of the subsurface layer with fine particles was much less pronounced and the specific weal increased drastically. |