Study on the development of a quaternary layer of B4C-TiB2-Al3Ti-Al in AA7050 / B4C Ex-Situ composite and influence of heat treatment on mechanical and wear properties / Arvind Kumar and Ram Naresh Rai

Kumar*,, Arvind and Rai, Ram Naresh (2020) Study on the development of a quaternary layer of B4C-TiB2-Al3Ti-Al in AA7050 / B4C Ex-Situ composite and influence of heat treatment on mechanical and wear properties / Arvind Kumar and Ram Naresh Rai. Journal of Mechanical Engineering (JMechE), 17 (2). pp. 129-139. ISSN 1823-5514 ; 2550-164X

Abstract

In the current investigation, AA7050-B4C composite developed through flux assisted (K2TiF6 flux) stir casting method. The FESEM microstructure studies confirm the uniform distribution of the reinforcements. The EDAX analysis confirms the formation of the intermetallic phase of TiB2 and Al3Ti across the interface of B4C particles and the aluminium matrix. The developed composite was heat treatment as per T-6 specifications, and a comparative study has been done on microstructures, mechanical properties and wear properties for ascast composite(ACC) and Heat-treated composite (HTC). The effect of heat treatment on the microstructure and bond mechanism shows that the B4C particles are fairly incorporated in the matrix. Ti decomposes and forms quaternary layers of B4C-TiB2-Al3Ti-Al across B4C particles. These layers not only prevent the decomposition of B4C particles into the matrix, also acts as the effective load transfer layers. Consequently, there is an enhancement in tensile strength by 16.4%, hardness by 15.9%, compressive strength by 14.8%, and impact strength by 10.9%. This may be due to the interface strengthening and precipitation hardening mechanism. There is a significant reduction in wear rate and coefficient of friction after heat treatment; this may be due to the improvement in hardness and compressive strength of the composite.

Metadata

Item Type: Article
Creators:
CreatorsEmail / ID. Num
Kumar*,, Arvindarvjha5@gmail.com
Rai, Ram NareshUNSPECIFIED
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Universiti Teknologi MARA, Shah Alam > Faculty of Mechanical Engineering
Journal or Publication Title: Journal of Mechanical Engineering (JMechE)
Journal: UiTM Journal > Journal of Mechanical Engineering (JMechE)
ISSN: 1823-5514 ; 2550-164X
Volume: 17
Number: 2
Page Range: pp. 129-139
Official URL: https://jmeche.uitm.edu.my/
Item ID: 36562
Uncontrolled Keywords: AA7050/B4C composite; wear; stir casting; K2TiF6 flux; ACC; HTC
URI: http://ir.uitm.edu.my/id/eprint/36562

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