Effect of Alumina Dispersion on Microstructural and Nanomechanical Properties of Pulse Electrodeposited Nickel-Alumina Composite Coatings
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第8期
论文作者：Ankur Gupta Swetha Barkam Debrupa Lahiri R.Balasubramaniam Kantesh Balani
文章页码：808 - 813
摘 要：Nickel-gamma alumina（Ni—γAI2O3） composite coatings were synthesized by pulsed electrodeposition technique with different concentrations of alumina（0,10,20 and 50 g/L） in Watt’s bath.Both ultrasonic vibration and magnetic-stirring were utilized to disperse Al2O3 and to achieve its optimum loading.Microstructure shows that agglomerates occur at higher loadings,but 10 g/L Al2O3 addition in bath has shown uniform dispersion of alumina with improved mechanical properties such as hardness,Young’s modulus and yield strength by 40%,46%and 35%,respectively,when compared to that of pure Ni coating.Further,elasto-plastic indentation mechanics has shown that strength at 29%strain is enhanced to 110.5 GPa for 10 g/L Al2O3electrophoretically deposited Ni—yAI2O3 coating when compared to that of electrodeposited Ni（81.8 GPa）.
Ankur Gupta1，Swetha Barkam1，Debrupa Lahiri2，R.Balasubramaniam1，Kantesh Balani1
1. Department of Materials Science & Engineering,Indian Institute of Technology,Kanpur 208016,India2. Department of Metallurgical and Materials Engineering,Indian Institute of Technology,Roorkee 247667,India
摘 要：Nickel-gamma alumina（Ni—γAI2O3） composite coatings were synthesized by pulsed electrodeposition technique with different concentrations of alumina（0,10,20 and 50 g/L） in Watt’s bath.Both ultrasonic vibration and magnetic-stirring were utilized to disperse Al2O3 and to achieve its optimum loading.Microstructure shows that agglomerates occur at higher loadings,but 10 g/L Al2O3 addition in bath has shown uniform dispersion of alumina with improved mechanical properties such as hardness,Young’s modulus and yield strength by 40%,46%and 35%,respectively,when compared to that of pure Ni coating.Further,elasto-plastic indentation mechanics has shown that strength at 29%strain is enhanced to 110.5 GPa for 10 g/L Al2O3electrophoretically deposited Ni—yAI2O3 coating when compared to that of electrodeposited Ni（81.8 GPa）.
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