Post solutionising rolling sway on the precipitation behaviour of eutectoid steel powder reinforced al7075 ternary alloy composites

Rajesh, Sathyashankara Sharma, M. C. Gowrishankar, Manjunath Shettar, Pavan Hiremath, Anand Hegde

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The solitary distinguished thermal treatment to aluminium alloy matrix of nonferrous group with uniformly dispersed reinforcement particles is precipitation or age hardening with or without mechanical working. Al7075 ternary alloy composites belongs to Al-Zn-Mg group and bulk properties can be enhanced by the formation of the immensely small consistently spread out precipitates of solute rich second phase within the matrix phase. The treatment comprises solutionising (550oC) supported by controlled aging (100 and 180o C) below the solvus temperature of the given alloy. Aging expedites the diffusion of solute atoms to form secondary particles (intermetallics) from the room temperature super saturated solid solution. This process is supported by deformation known as rolling as post activity, develops strain hardening in matrix and reinforcement. The present work shows the distinction in the aging phenomenon on alloy and alloy matrix composites (reinforced with 3 and 6 wt% of eutectoid steel powder, 10-30 micron size) upon undergoing cold rolling prior to aging i.e., after solution treatment. The variation in the hardness distribution with aging kinetics for both aging temperatures with and without cold deformation (10 and 20%) in between the consecutive stages like, solution treatment and aging were investigated and peak hardness values were noted in each aging temperatures and results were analysed. In every hardness test 10 trials were performed and the average of 6 consistent readings are taken as the outcome. 20 to 40% improvement in peak hardness is observed with intentional deformation over without deformation. The composite may be used for light duty cold working dies where bulk hardness and frictional characteristics are very important.

Original languageEnglish
Title of host publicationFrontiers of Composite Materials IV
EditorsDarren Martin, Tatiana Perova
PublisherTrans Tech Publications Ltd
Pages9-14
Number of pages6
ISBN (Print)9783035715965
DOIs
Publication statusPublished - 2020
Event4th International Conference on Frontiers of Composite Materials, ICFCM 2019 and 4th International Conference on Energy Engineering and Smart Materials, ICEESM 2019 - Brisbane, Australia
Duration: 13-11-201916-11-2019

Publication series

NameMaterials Science Forum
Volume995 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference4th International Conference on Frontiers of Composite Materials, ICFCM 2019 and 4th International Conference on Energy Engineering and Smart Materials, ICEESM 2019
CountryAustralia
CityBrisbane
Period13-11-1916-11-19

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Rajesh, Sharma, S., Gowrishankar, M. C., Shettar, M., Hiremath, P., & Hegde, A. (2020). Post solutionising rolling sway on the precipitation behaviour of eutectoid steel powder reinforced al7075 ternary alloy composites. In D. Martin, & T. Perova (Eds.), Frontiers of Composite Materials IV (pp. 9-14). (Materials Science Forum; Vol. 995 MSF). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.995.9