Formability of Sintered Al, Al-Cu and Al-Cu-TiC composites during cold upsetting

Khan, M.N. and Narayan, Sumesh and Ananthanarayanan, Rajeshkannan and Jeevanantham, A.K. (2020) Formability of Sintered Al, Al-Cu and Al-Cu-TiC composites during cold upsetting. Materials Today: Proceedings, 22 (4). pp. 2499-2508. ISSN 2214-7853

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Abstract

This work examines the formability characteristics of sintered Aluminium (Al) composites during cold upsetting. Formability evaluates the extent of deformation that materials can withstand without the initiation of cracks or before yielding in the forming process. As such, formability studies are critical in order to produce defect free components. This study is particularly necessary for parts produced by the Powder metallurgy (PM) technique, considering the high volume of pores present in PM components even after the sintering process. Thus, this study experimentally investigates the effects of different weight percent of Copper (Cu) and Titanium carbide (TiC) addition to the Al composite preforms. To determine the formability behavior; Al, Al-3%Cu, Al-6%Cu, Al-3%Cu-2%TiC, Al-3%Cu-4%TiC, Al-6%Cu-2%TiC and Al-6%Cu-4%TiC with aspect ratios (height/ diameter) of 0.45 and 0.9 were cold upset under different frictional conditions (nil/ no lubricant, graphite lubricant and zinc stearate lubricant). Consequently, the effects of reinforcement addition to the Al composite and initial preform geometry on the relative density, R, are investigated. Moreover, other influencing physical parameters such as axial stress and the formability stress index, β are also graphically presented. It has been established from this study that the nil lubricated lower aspect ratio TiC containing compacts generally achieved improved densification, higher values of axial stresses and consequently better formability. However, the addition of Cu and TiC limits the height strain to fracture.

Item Type:	Journal Article
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics
Depositing User:	Rajeshkannan Ananthanarayanan
Date Deposited:	06 Dec 2020 23:14
Last Modified:	06 Dec 2020 23:14
URI:	https://repository.usp.ac.fj/id/eprint/12371

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