7475-T761航空铝合金的物相分析  被引量:2

Phase analysis of 7475-T761 aviation aluminum alloy

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作  者:李茂华[1] 杨延清[2] 唐昌平[1] 陈志龙 莫家璇 LI Mao-hua;YANG Yan-qing;TANG Chang-ping;CHEN Zhi-long;MO Jia-xuan(Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province,Hunan University of Science and Technology,Xiangtan 411201,China;School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区:[1]湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湖南湘潭411201 [2]西北工业大学材料学院,陕西西安710072

出  处:《材料热处理学报》2021年第9期68-75,共8页Transactions of Materials and Heat Treatment

基  金:国家自然科学基金(52075167)。

摘  要:利用透射电镜(TEM)、能谱仪(EDX)、选区电子衍射(SAED)、微束衍射(μ-D)、高分辨透射电镜(HRTEM)和高角环形暗场扫描透射电镜(HAADF-STEM)等研究了航空用7475-T761铝合金的微观组织。结果表明,7475-T761铝合金的组织主要由弥散相、时效强化相和杂质相组成。弥散相为形态多样的E相(Al_(18)Cr_(2)Mg_(3)),且E/Al相界面易非均匀析出η相。时效强化相主要为GPⅡ区、η′相和η相。杂质相主要由Al_(7)Cu_(2)Fe、FeAl_(3)和富Si相组成。Microstructure of 7475-T761 aviation aluminum alloy was studied by means of transmission electron microscopy(TEM),energy dispersive X-ray spectroscopy(EDX),selective area electron diffraction(SAED),micro beam diffraction(μ-D),high resolution transmission electron microscopy(HRTEM)and high angle annular dark field scanning transmission electron microscopy(HAADFSTEM).The results show that the microstructure of the 7475-T761 aluminum alloy is mainly composed of dispersed phase,aging strengthening phase and impurity phase.The dispersed phase is E phase(Al_(18)Cr_(2)Mg_(3))with various morphology,and theηphase is easy to precipitate inhomogeneously at the E/Al interface.The aging strengthening phases are mainly composed of GPⅡzones,η′phase andηphase.The impurity phases are mainly composed of Al_(7)Cu_(2)Fe,FeAl3 and Si-rich phases.

关 键 词:7475铝合金 弥散相 时效强化相 杂质相 

分 类 号:TG146.2[一般工业技术—材料科学与工程]

 

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