Mechanical Properties Of W/Cu-Zn Metal Composite Via Mechanical Alloying

Ahmad Zaidi, Ideris (2011) Mechanical Properties Of W/Cu-Zn Metal Composite Via Mechanical Alloying. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this research is investigate the mechanical alloying process of 40%W-30% Zn-30% Cu from the elemental powders of W, Zn and C by a high energy ball mill in argon atmosphere was investigated. The mechanical alloying process parameters such as milling speed and milling time, were varied in order to investigate their influence on the micro structural evolution of mechanically alloyed powders. The mechanical alloying process proceeded following two sample A and B Including sample A is 20% Cu,40% Zn and 40%W,sample B,30% Cu, 30% Zn and 40% W, the sample would be sintered at temperature 850 degree of celcius by heating is 10 degree celcius per minute.. The microstructure of the alloy sample would be identifying by using SEM and immersion method has been used for corrosion test to test weight loss. The mechanical test that involve in this research is hardness test by using micro Vickers and density by using Archimedes method. Hardness test showed that sample A is higher than sample B. the value is 69.3hv, it because increasing the milling time is one of the factor it could be highest. Rotational speeds of ball milling reduce the size of particle and make the composition of that alloy become more refine and little porosity. OM and SEM were used to analyze the microstructure. For the density result, the highest peak of density for sample B is at 50rpm and 24hour, 7.561 g/cm^3 and the lowest at 100rpm 48 hour, 6.31 g/cm^3 before sintering, the decrease of the green density with the milling time can be due to many factors. Sample A at parameter 50rpm and 48 hour is a high corrosion resistance by affect of the smallest grain size and microstructure.

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