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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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磨球级配对MA-SPS原位合成Al13Fe4/Al复合材料的组织结构及力学性能的优化*
DOI: 10.11900/0412.1961.2014.00283, PP. 216-222
Keywords: 机械合金化,放电等离子烧结,原位合成,Al13Fe4/Al复合材料,级配
Abstract:
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α-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(1~2mm)、超细颗粒(0.1~1.0mm)和纳米颗粒(20nm)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α-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227HV,抗压强度为845.8MPa,最大塑性变形量为13.6%。
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