Research On High-Speed Dry Friction And Wear Properties Of Al-mn Alloy And Its Composite Materials

To promotion water saving irrigation project works, we need to create newmaterials with excellent wear resistance,to replace the traditional single materials, inorder to extend the service life, reduce the cost.So this paper aims to research on thefriction and wear properties of Al-Mn alloy and its composite materials which maybehave good wear resistance.In this paper,use the M18XHF22-RA X-ray diffraction(XRD) to detect phase;use the M-2000type testing machine to test the high-speed dry friction and wearproperties of Al-Mn Alloy and its composite materials;use the TG328A (S)-typeelectro-optical analytical balance to weigh the amount of wear of the sample;use theLED-1430VP scanning electron microscope(SEM) to observe the wear scarmorphology of the sample.In this way, analyse the internal structure and mechanicalproperties of Al-Mn alloy and its composite materials;high-speed friction and wearproperties test of the Al-Mn Alloy and its composite materials which with thedifferent manganese content will be tested under different pressures;analysis andcompare the sample coefficient of friction;comparison of the amount of wear andanalysis and comparison of the wear scar of the worn specimen will be accomplished.The results show that:the internal organization of the Al-Mn Alloy is that:withthe increase of the manganese content, the second phase of the form will be morethick,more shorter,and the head of it will be also form circular to variance,and notclosely connected with the matrix,and there is crack in the internal; the metallurgicalstructure of the Al₂O₃particle reinforced Al-Mn-based composite is that:they arecomposed by in manganese in the aluminum solid solution and on the distribution ofaluminum-manganese compounds MnAl6,A111Mn4and δ-Al₂O₃particles;with theincrease of the manganese content,in the sample,the hard and brittle MnAl6andA111Mn4content are also increasing,the δ-Al₂O₃particles concentrations are roughlyconstant,make the Al-Mn-based composite materials to become more dense,and hardness has improved greatly compared with Al-Mn Alloy;under the same load,theamount of the wear of the Al₂O₃particle reinforced Al-Mn-based composite must belower than the corresponding matrix alloy;with the increase of the load,the wear of thetwo specimens will be intensified,but the degree of the wear of the increase of thelater is more smaller than the former.These demonstrates that Al₂O₃particle play apositive role in the sliding friction and wear properties of Al-Mn-based compositematerials,and the wear mechanism was also changed.