The Fe-rich intermetallic compounds in Al-17Si-2 Fe were modified via Al-Mn-Ti quasicrystal master alloy.The effect of master alloy content on the Fe-rich phase morphology was studied by scanning electron microscope(S...The Fe-rich intermetallic compounds in Al-17Si-2 Fe were modified via Al-Mn-Ti quasicrystal master alloy.The effect of master alloy content on the Fe-rich phase morphology was studied by scanning electron microscope(SEM)and thermodynamic calculation.Results show that the microstructure of the Al-Mn-Ti master alloy consists of binary quasicrystal matrix and ternary AlMnTi secondary phase.The evolutive tendency of Fe-rich intermetallic compounds with content of quasicrystal Al-Mn-Ti master alloy increasing can be described as follows:long needle-shapedβphase for Al-17 Si-2 Fe alloy,long plate-shaped ternaryδphase for 3 wt%master alloy addition,Chinese-script and polyhedralαphases for 4 wt%master alloy addition and finer plate-shaped quaternaryδphase with a phases for 5 wt%master alloy addition.The ultimate tensile strength of the Al-17 Si-2 Fe alloy with4 wt%master alloy addition(a mass ratio of w(Mn)/w(Fe)≈0.7)increases by 23.8%and the friction coefficient decreases from 0.45 to 0.35 compared with those of Mnfree alloy.α-Fe phases have less negative effect on the matrix compared with the long needle-shapedβphase and the plate-shapedδphase.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51201071)the National Natural Science Foundation of Jiangsu Provence(BK20161270)Jiangsu Overseas Visiting Scholar Program for University Prominent Young&Middle-aged Teachers and Presidents(2018)。
文摘The Fe-rich intermetallic compounds in Al-17Si-2 Fe were modified via Al-Mn-Ti quasicrystal master alloy.The effect of master alloy content on the Fe-rich phase morphology was studied by scanning electron microscope(SEM)and thermodynamic calculation.Results show that the microstructure of the Al-Mn-Ti master alloy consists of binary quasicrystal matrix and ternary AlMnTi secondary phase.The evolutive tendency of Fe-rich intermetallic compounds with content of quasicrystal Al-Mn-Ti master alloy increasing can be described as follows:long needle-shapedβphase for Al-17 Si-2 Fe alloy,long plate-shaped ternaryδphase for 3 wt%master alloy addition,Chinese-script and polyhedralαphases for 4 wt%master alloy addition and finer plate-shaped quaternaryδphase with a phases for 5 wt%master alloy addition.The ultimate tensile strength of the Al-17 Si-2 Fe alloy with4 wt%master alloy addition(a mass ratio of w(Mn)/w(Fe)≈0.7)increases by 23.8%and the friction coefficient decreases from 0.45 to 0.35 compared with those of Mnfree alloy.α-Fe phases have less negative effect on the matrix compared with the long needle-shapedβphase and the plate-shapedδphase.
