Effects of solution treatment temperature on the mechanical properties of commercial recycled aluminium alloy cylinder head (A319)
The present work was performed to investigate the effect of different solution treatment temperature on commercial recycled aluminium alloy cylinder head during artificial ageing process. All samples were sectioned from recycled automotive cylinder head and solution heat treated at 495°C, 510°C a...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12854/1/p.%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/12854/2/Full%20Text.pdf |
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| Summary: | The present work was performed to investigate the effect of different solution treatment
temperature on commercial recycled aluminium alloy cylinder head during artificial ageing
process. All samples were sectioned from recycled automotive cylinder head and solution
heat treated at 495°C, 510°C and 525°C each for a period of 10 hours. All samples were then
quenched into ice water at 0°C and followed by artificial ageing at 180°C for a time up to 20
hours. The precipitation behaviours was monitored by Vicker’s microhardness test and
electrical resistivity measurement. Precipitation occurrence were characterised by thermal
analysis method and SEM/EDX technique on critical sample. The effect of heat treatment
processes was observed by metallographic technique.
It is seen that the aluminium alloy exhibit age hardening response similar to artificial ageing
where as the the peak-age hardening accelerated when higher solution temperature applied.
The hardening effect achieved was due to precipitation of metastable phases of θ˝/θ΄, β˝/β΄,
and Q˝Q΄ except for 495°C where the coarser silicon particles contributes to the peak-aged
hardening. Silicon particle were fragmentised and spherodised during high temperature
solution treatment and homogenised into the aluminium matrix. Prolonged artificial ageing
resulting the silicon particles to growth and reduces the nucleation site for phases
precipitation, thus reduce the aluminium alloy hardening. |
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