Efficacy of α-β grade titanium alloy powder (Ti–6Al–2Sn–2Zr–2Mo–2Cr–0.25Si) in surface modification and corrosion mitigation in 3.5% NaCl on friction stir processed armour grade 7075-T651 aluminum alloys—insight in defence applications

Content Provider	Scilit
Author	Ikumapayi, Omolayo Michael Akinlabi, Esther T.
Copyright Year	2019
Description	Journal: Materials Research Express Aluminium alloy AA7075-T651 is one of the newest and promising commercial rolled sheet metal for structural applications in defensive areas like military, space and air vehicle, aerospace because of its excellent and unbeatable combination of high strength-to-weight ratio and good corrosion resistance, high fatigue strength. In this study friction stir processing (FSP) was performed on AA7075-T651 aluminium metal composite (AMC) reinforced with α-ꞵ grade titanium alloy powder (Ti-6Al-2Sn-2Zr-2Mo-2Cr-0.25Si) which is an excellent reinforcement material in airframe and jet engine applications for corrosion resistance and exceptional strength-to-weight ratio. The processing parameters used were the rotational speed of 1500 rpm, processing speed of 20 mm/min, plunge depth of 0.3 mm and tilt angle of 3 °. Two passes were carried out on the FSP parameters with 100 % inter-pass overlap. Mechanical characterization was carried out to study the influence of α-ꞵ grade titanium alloy powder (Ti-6Al-2Sn-2Zr-2Mo-2Cr-0.25Si), in this tensile strength was studied using Xforce P type of Zwick/Roell Z250 tensile testing machine and surface roughness analysis was conducted on mitutoyo surftest SJ-210 surface roughness tester. Corrosion behaviour of the processed AMC was studied using potentiodynamic polarization technique in 3.5 % NaCl solution at an ambient temperature of 25 °. It was established that α-ꞵ grade titanium alloy powder as reinforcement inhibitor produced highest percentage of inhibition performance efficiency (IPE) of 98.26 % while the processed base metal (PBM) gave IPE of 63.99 % with reference to unprocessed base metal (UBM). There was extra-ordinary improvement in corrosion rate with a reduction from 5.0718 mm/year to 0.087675 mm/year when α-ꞵ grade titanium alloy powder was used as inhibitor. AA7075-T651/ Ti-6Al-2Sn-2Zr-2Mo-2Cr-0.25Si AMC has highest UTS of 624.2276 MPa which has a close value of 620.903 MPa to AA7075-T65 without reinforcement but the UTS for UBM was far away from them.
Related Links	https://iopscience.iop.org/article/10.1088/2053-1591/ab1566/pdf
ISSN	20531591
e-ISSN	20531591
DOI	10.1088/2053-1591/ab1566
Journal	Materials Research Express
Issue Number	7
Volume Number	6
Language	English
Publisher	IOP Publishing
Publisher Date	2019-04-02
Access Restriction	Open
Subject Keyword	Journal: Materials Research Express Automotive Engineering Coatings and Films Surface Roughness 2mo 2cr 2sn 2zr 6al 2sn 2cr 0.25si 2zr 2mo
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Metals and Alloys Biomaterials Electronic, Optical and Magnetic Materials Polymers and Plastics