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对掺杂不同原子分数(80%、85%、90%、95%)的铝粉和高碳铬铁粉末混合压坯进行激光诱导自蔓延烧结,利用金相显微镜、X射线衍射仪及硬度计、磨粒磨损机、电化学腐蚀仪等试验仪器,分析烧结合金的显微组织、物相结构及力学性能。结果表明:烧结合金物相主要为α-Al、Al_2Fe、AlFe、Fe_2AlCr、Al_2O_3及富Al相,随着Al含量增多,富Al相Al_(13)Fe_4、Al_(13)Cr_2逐渐消失,产物相多转化为固溶体α-Al相;在Al含量为80%时,烧结合金孔隙率(1.7%)最小,烧结密度(3.35 g/cm~3)最大,硬度(817.5 HV0.2)最高,烧结合金的磨损率(0.08 mg/mm~2)最低;合金耐蚀性能在Al含量为90%时最好,钝化电流(110.3μA/cm~2)最小。
The laser-induced self-propagating sintering was carried out on the mixed green compact with different atomic fraction (80%, 85%, 90%, 95%) of aluminum powder and high-carbon ferrochromium powder. The microstructures were characterized by metallographic microscope, X- , Abrasive wear machine, electrochemical corrosion tester and other test equipment, analysis of sintered alloy microstructure, phase structure and mechanical properties. The results show that the phase of the sintered alloy is mainly composed of α-Al, Al 2 Fe, AlFe, Fe 2 AlCr, Al 2 O 3 and Al rich phase. With the increase of Al content, Al 13 Al Fe 13 and Al 13 Cr 2 gradually disappear. The porosity of the sintered alloy is the smallest (1.7%), the sintering density is the highest (3.35 g / cm ~ 3), the hardness is the highest (817.5 HV0.2), and the sintered alloy The wear rate (0.08 mg / mm ~ 2) is the lowest. The corrosion resistance of the alloy is the best when the Al content is 90%. The passivation current (110.3μA / cm ~