Abstract: (Al3Zr+ Al2O3)p/A359 composites were fabricated by direct melt reaction method in novel system A359-Zr(CO3)2 . The dry sliding wear properties of these composites were studied. The results show that the wear mass loss of (Al3Zr+ Al2O3)p/A359 composites is less than that of A359 matrix alloy with increasing load and sliding time. The wear mass loss of (Al3Zr+ Al2O3)p/A359 composites decreases further with the increase of Al3Zr and Al2O3 volume fraction under the same condition because of Al3Zr and Al2O3 supporting and reducing milling. Under the condition that the load is 98 N, the wear mass loss of 12%(Al3Zr+Al2O3)P/A359 composites is only 20.2 mg, whereas the wear mass loss of A359 matrix alloy is 54.5 mg. Thus the wear-resisting property of this composite is enhanced by 2.5 times than its matrix A359 alloy. The observation of wear surface of (Al3Zr+ Al2O3)p/A359 composites and the matrix A359 alloy with the help of SEM indicates that severe adhesion and deformation occurs on the wear surface of A359 alloy. The wear mechanism of the matrix A359 alloy is stripped and adhesive wear, while the wear surface of (Al3Zr+ Al2O3)p/A359 composites is superior to that of the matrix A359 alloy. The wear mechanism of (Al3Zr+ Al2O3)p/A359 composites is abrasive wear.
Dry sliding wear characteristics and mechanism of in-situ composites synthesized by A359-Zr(CO3)2 reaction system
Abstract:
(Al3Zr+ Al2O3)p/A359 composites were fabricated by direct melt reaction method in novel system A359-Zr(CO3)2 . The dry sliding wear properties of these composites were studied. The results show that the wear mass loss of (Al3Zr+ Al2O3)p/A359 composites is less than that of A359 matrix alloy with increasing load and sliding time. The wear mass loss of (Al3Zr+ Al2O3)p/A359 composites decreases further with the increase of Al3Zr and Al2O3 volume fraction under the same condition because of Al3Zr and Al2O3 supporting and reducing milling. Under the condition that the load is 98 N, the wear mass loss of 12%(Al3Zr+Al2O3)P/A359 composites is only 20.2 mg, whereas the wear mass loss of A359 matrix alloy is 54.5 mg. Thus the wear-resisting property of this composite is enhanced by 2.5 times than its matrix A359 alloy. The observation of wear surface of (Al3Zr+ Al2O3)p/A359 composites and the matrix A359 alloy with the help of SEM indicates that severe adhesion and deformation occurs on the wear surface of A359 alloy. The wear mechanism of the matrix A359 alloy is stripped and adhesive wear, while the wear surface of (Al3Zr+ Al2O3)p/A359 composites is superior to that of the matrix A359 alloy. The wear mechanism of (Al3Zr+ Al2O3)p/A359 composites is abrasive wear.
图5所示为滑动速度为0.42 m/s, 载荷为58.8 N, 滑动时间为90 min时, 12%(Al3Zr+
图5 12%(Al3Zr+Al2O3)P/A359复合材料 磨损表面的SEM形貌 Fig.5 SEM photographs of wear surface of 12%(Al3Zr+Al2O3)p/A359 composites (a)—Wore surface; (b)—Tore pit; (c)—Furrow formed by wear