Microstructural features and mechanical properties of Al 5083/SiC_p metal matrix nanocomposites produced by high energy ball milling and spark plasma sintering

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• 作者：Sivaiah Bathula ; ^{bsivaiah@gmail.com} ; ^{sivaiahb@mail.nplindia.org} ; R.C. Anandani ; Ajay Dhar ; A.K. Srivastava
• 关键词：Powder metallurgy ; Electron microscopy ; Al 5083/10  ; wt.%SiCp nanocomposite ; Spark plasma sintering ; Interfaces
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：30 May, 2012
• 卷：545
• 期：Complete
• 页码：97-102
• 文件大小：1458 K

摘要

Al 5083 alloy powder with 10 wt.%(鈭?.43 vol.%) of silicon carbide (SiC_p) nanoparticulates having size of 鈭?0 nm were milled using a high-energy planetary ball mill to produce Al 5083/10 wt.%SiC_p (Al 5083/SiC_p) nanocomposite. Subsequently, the milled powders were consolidated and sintered by employing spark plasma sintering (SPS) technique in order to attain the near theoretical densification while retaining the nanostructure of Al 5083 matrix embedded with uniformly distributed SiC_p. High resolution transmission microscopy (HR-TEM) analysis revealed the grain morphology and grain size of the Al 5083 matrix along with the interfacial microstructure between Al 5083 matrix and SiC_p particulates. The crystallite size of ball milled Al 5083 matrix was observed to be 鈭?5 nm and was coarsened up to 30 nm after rapid consolidation and sintering using SPS. Compressive strength and elastic modulus of Al 5083/SiC_p metal matrix nanocomposites was significantly increased to that of the un-reinforced Al 5083 alloy. Nanoindentation measurements on these nanocomposites demonstrated the hardness of 鈭?80 HV with an elastic modulus of 126 GPa.