Safarzadeh, Marjan
(2014)
Joining Of Alumina-Based Composite To 6061 Aluminum
Alloy By Friction Welding.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
The present research is aimed at evaluating the feasibility of using the
friction welding of mullite and Alumina-Mullite composite with 6061 Alalloy,
and subsequently determining their microstructural and mechanical
properties. During the process, friction force (1000 bar) and friction time (30
Sec) were held constant while the rotational speed was varied. Ceramic rods
aluminium rods were machined down to get the require dimension and then
polished. Sintering behaviour of ceramic samples were investigated. It was
concluded that the mullite rods didn't join to 6061 Al-alloy due to the low
fracture toughness of the mullite. Thus, fracture toughness was improved
through the composite of Alumina-Mullite. Welding process was carried out
under two different rotational speeds (1250 and 1800rpm) and the effect of
increasing rotational speed on microstructure, microhardness and mechanical
properties of Alumina-Mullite composite/6061 Al-alloy joined was evaluated.
It was observed that a good microstructure with higher mechanical properties
(microhardness and bending strength) were achieved from the joining of
Alumina-Mullite composite with 6061 Al-alloy at higher rotational speed
(1800 rpm). The mechanisms of failure at the fracture surfaces revealed
different feature at different speed. At the higher speed dimple and ductile
formed which implies the plastic deformation.
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