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采用机械合金化-放电等离子体烧结(MA-SPS)技术原位合成近全致密的Al13Fe4/Al复合材料.在MA过程中采用磨球级配对材料的组织结构和性能进行了优化.利用XRD,SEM,TEM,显微硬度计和力学性能测试系统等手段对粉末及烧结试样的组织结构和性能进行了分析表征.结果表明,相同MA时间下,采用磨球级配可有效提高球磨效果,其粉末粒径分布更均匀,固溶度也得到很大的提高.SPS烧结后,复合材料的组织由a-Al和金属间化合物Al13Fe42相构成.金属间化合物Al13Fe4相的形态分为大颗粒(1~2 mm)、超细颗粒(0.1~1.0 mm)和纳米颗粒(20 nm)3种,其中大颗粒和超细颗粒Al13Fe4由未固溶的Fe与Al直接反应原位生成,纳米颗粒Al13Fe4是Fe从过饱和Al(Fe)固溶体中析出生成.采用磨球级配处理的Al-10Fe合金含有更多大颗粒a-Al和超细颗粒Al13Fe4,因此它具有更优的综合力学性能,显微硬度为227 HV,抗压强度为845.8 MPa,最大塑性变形量为13.6%.
In-situ synthesis of Al13Fe4 / Al composites with mechanical alloying-discharge plasma sintering (MA-SPS) technique was used to optimize the microstructure and properties of the materials during the MA process.Using XRD, SEM, TEM, microhardness tester and mechanical properties testing system were used to characterize the microstructure and properties of the powder and sintered samples.The results show that ball milling can effectively improve the ball milling performance under the same MA time, The powder particle size distribution is more uniform, the solid solubility has also been greatly improved.SPS sintering, the composite structure of a-Al and intermetallic compound Al13Fe42 phase composition intermetallic compound Al13Fe4 phase morphology is divided into large particles ( 1 ~ 2 mm), ultrafine particles (0.1 ~ 1.0 mm) and nanoparticles (20 nm). Among them, the large and ultrafine particles Al13Fe4 were formed by the direct reaction of unsoluble Fe and Al in situ. The nanoparticles Al13Fe4 Is the precipitation of Fe from the supersaturated Al (Fe) solid solution.The Al-10Fe alloy treated with the spheroidal ball contains more large particles of a-Al and ultrafine particles Al13Fe4, so it has better comprehensive mechanical properties Microhardness of 227 HV, compressive strength of 845.8 MPa, the most 13.6% amount of plastic deformation.