Jie Chen
,
Chong-Gao Bao
,
Yong Wang
,
Jin-Ling Liu
,
Challapalli Suryanarayana
金属学报(英文版)
doi:10.1007/s40195-015-0333-6
Magnesium matrix composites reinforced with AlN particles were fabricated by the powder metallurgy technique. The evolution of lattice constants and solid solubility levels of Al in α-Mg and the microstructure of Mg-Al/AlN composites were investigated in the present study. The results showed that the solid solubility of Al in α-Mg reached a relatively high level by the P/M process with a long time of milling. X-ray diffraction showed that the peaks of Mg phase clearly shifted to higher angles. The lattice constants and cell volume decreased significantly compared with those of standard Mg due to a significant amount of Al incorporated into α-Mg in the form of substitutional solid solution. The degree of lattice deformation decreased at a low sintering temperature and increased at higher sintering temperatures due to the presence of AlN. Microstructural characterization of the composites revealed a necklace distribution of AlN particles in the Mg matrix. Heat treatment led to precipitation of Mg17Al12 from the supersaturated α-Mg solid solution. The precipitate exhibited granular and lath-shaped morphologies in Mg matrix and flocculent precipitation around AlN particles.
关键词:
Metal matrix composite
,
AlN particle
,
Microstructure
,
Lattice parameter
,
Powder metallurgy
,
Solid solubility
Chunlin HE
,
Changsheng LIU
,
Fengqin LI
,
Qingkui CAI
,
Zhiming SHI
,
Liqing CHEN
,
Jing BI
材料科学技术（英）
The corrosion resistance of 2024 Al and SiC particle reinforced 2024 Al metal matrix composite (SiCp/2024Al MMC) in 3.5% NaCl solution was investigated with electrochemical method and immersion test, and the corrosion protection of sulfuric acid anodized coatings on both materials was evaluated by electrochemical impedance spectroscopy. The results showed that the SiCp/2024Al MMC is more susceptible to corrosion than its matrix alloy in 3.5% NaCl. For 2024Al, the anodized coating provides excellent corrosion resistance to 3.5% NaCl.The anodized coating on the SiCp/2024Al provides satisfactory corrosion protection, but it is not as effective as that for 2024Al because the structure of the anodized layer is affected by the SiC particulates.
关键词:
2024 Al
,
null
,
null
,
null
A.Cantarel
,
E.Lacoste
,
O.Mantaux
,
E.Arquis
,
M.Danis
材料科学技术（英）
Injection of liquid alloy through a fibrous preform located in an initially preheated mould is a classical method used to process metal matrix composites (MMCs). In order to reduce the chemical reactions between the fibres and the metal matrix, the fibrous reinforcement and the mould are commonly preheated up to initial temperatures much lower than the metal solidification temperature. Therefore, metal solidification instantaneously occurs on fibre contact during composites infiltration. Unlike what happens when infiltrating a pure metal, temperature and composition are able to vary within the matrix; these heterogeneities induce macrosegregation within composites...
关键词:
Segregation
,
null
,
null
新型炭材料
doi:10.1016/s1872-5805(12)60010-9
采用机械合金化技术制备高分散多壁碳纳米管( MWCNTs) -铝(Al)复合材料.将纯度99％的铝粉和质量分数2％的MWCNTs经超声和水平球磨处理使Al颗粒与MWCNTs间产生机械键合力.场发射SEM观察表明,MWCNTs分散在Al薄片的表面,随球磨时间的不同,颗粒大小和形貌各异.采用加压烧结手段将混合粉末加工成块体材料,其微观硬度测试表明,加入MWCNTs后Al基体的机械性能得到提高.
关键词:
多壁碳纳米管
,
金属基体复合材料
,
球磨
