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|Title:||Flow Properties of Cast Al-Zn-Mg Alloys Subjected to Equal Channel Angular Pressing|
Preetham, Kumar, G.V.
Udaya, Bhat, K.
|Citation:||IOP Conference Series: Materials Science and Engineering, 2018, Vol.376, 1, pp.-|
|Abstract:||Flow stress can be described as the stress necessary to continue deformation at any stage of plastic strain. The strength coefficient (K) and strain-hardening exponent (n) are the two important flow properties of the material. In the present work, flow properties of three different cast Al-Zn-Mg alloys processed by equal channel angular pressing (ECAP) were investigated. ECAP processing was carried out in a die having ? = 120� and ? = 30�. After ECAP processing, significant grain refinement and increase in the hardness was observed. Compression test was used to determine the flow properties of ECAP processed samples. Force-stroke data was recorded from the compression test. Flow curves were drawn by using force-stroke data. Strength coefficient and strain-hardening exponent were determined from the log-log plot of true stress-strain curves. Significant increase in the strength coefficient was observed after ECAP processing. Also, the strength coefficient is increased when the zinc content is increased in the alloy. Strain-hardening exponent was decreased with increase in the number of ECAP passes. � Published under licence by IOP Publishing Ltd.|
|Appears in Collections:||2. Conference Papers|
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