X-ray tomography studies on porosity and particle size distribution in cast in-situ Al-Cu-TiB2 semi-solid forged composites

Abstract

. (2016) X-ray tomography studies on porosity and particle size distribution in cast in-situ Al-Cu-TiB2 semi-solid forged composites. Materials Characterization. Permanent WRAP URL:http://wrap.warwick.ac.uk/79069 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT1 X-ray tomography studies on porosity and particle size distribution in cast insitu Al-Cu-TiB 2 semi-solid forged composites forging reduction resulted in greater uniformity in distribution of TiB 2 particles within the composite compared to as-cast and the 50% forge reduction in semi-solid state. These results show that the application of forging in semi-solid state enhances particle distribution and reduces porosity formation in cast in-situ Al-Cu-TiB 2 metal matrix composites.

Effect of semi-solid forging on microstructure and mechanical properties of in-situ cast Al-Cu-TiB 2 composites

“…The possible reason for this could be the better distribution of TiB 2 particles and reduction in cluster size when subjected to 30% deformation [49]. The cluster size reduction and TiB 2 particle distribution in Al-4.5Cu-5TiB 2 composite with 30% reduction by semisolid forging was well explained in our recent X-ray computed tomography studies [28]. Kuruvilla et al [50] found that the extremely fine size TiB 2 particle reinforcements results in the improvement of elastic modulus of the aluminium matrix composite.…”

“…Recent X-ray computed tomography studies on Al-4.5%Cu-5%TiB 2 in-situ composite showed that semisolid forging has resulted in improvement of TiB 2 particle size distribution and reduction of particle clusters [28]. Additionally, Deepak Kumar et al [29], suggested that semisolid forging of Al-5TiB 2 composites improves mechanical properties of the composite.…”

A review on high stiffness aluminum-based composites and bimetallics

“…95 It is generally believed that the presence of a Al 3 Ti phase in Al/TiB 2 composites is beneficial for grain refinement but is detrimental to the mechanical properties. 96 The Al 3 Ti can be eliminated during synthesis by the proper control of temperature, time, and ratios of the raw materials. 91,97 The presence of Si in cast Al alloys can improve the dispersion of TiB 2 particles, 98 although the TiB 2 particles are still partially segregated in the eutectic regions because of the pushing mechanism during solidification.…”

Characterization of A356 aluminum matrix composite affected by SiC particle size and extrusion parameters

“…Tham et al [21] believed that processing-induced voids were eliminated by highly compressive hydrostatic stresses generated during high deformation degrees. However, Matthew et al [10] have observed that after a certain deformation degree, the quantity of porosity and clustering was slightly increased. Also, Shi et al [22] found that an increase in the degree of forging deformation from 40 % to 60 % caused enhanced localized strain and matrix hardening resulting in the matrix inability to easily squeeze into the voids and subsequent creation of new types of voids.…”

“…Sharifian [8] and Mousavian [9] have reported significant fragmentation of particles after the extrusion. The studies conducted by Matthew et al [10] indicated that 30 % forging reduction led to a greater uniformity of distribution of reinforcing particles compared to the ascast composite. It was also found that hot extrusion reduced the porosity and increased the interfacial bonding strength [11 -13].…”