Investigating Mechanical and Corrosion Behavior of Plain and Reinforced AA1050 Sheets Fabricated by Friction Stir Proces

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REPORT Ó 2020 The Minerals, Metals & Materials Society


Investigating Mechanical and Corrosion Behavior of Plain and Reinforced AA1050 Sheets Fabricated by Friction Stir Processing VINAYAK R. MALIK ,1,2,5,6 PADMAKUMAR A. BAJAKKE,1,2 SUDHAKAR C. JAMBAGI,3 CHAVANA NAGARJUNA,3 and ANAND S. DESHPANDE1,2,4 1.—Department of Mechanical Engineering, KLS Gogte Institute of Technology, Belagavi, Karnataka 590008, India. 2.—Visvesvaraya Technological University, Belagavi, Karnataka, India. 3.—Department of Mechanical engineering, National Institute of Technology Karnataka Surathkal, Mangaluru, Karnataka, India. 4.—Registrar, Visvesvaraya Technological University, Belagavi, Karnataka, India. 5.—e-mail: [email protected] 6.—e-mail: [email protected]

The present investigations help in improving the bendability and corrosion resistance of AA1050 rolled sheets by selective friction stirring. The processing of AA1050 with a tapered square pin at a tool rotation speed of 1200 rpm yielded the highest strain of 0.345 at ultimate tensile strength compared with 0.054 in as-received material. The identified processing conditions produced an ultimate tensile strength of 89.23 MPa with a toughness of 34.451 9 106 J/ m3 and a lower corrosion rate with Icorr of 0.324 9 106 A/cm2. Further, processing with a simple tapered circular pin resulted in maximum ultimate tensile strength of 102 MPa with a toughness of 33.990 9 106 J/m3. However, it came at the expense of least resistance to corrosion with Icorr of 4.813 9 106 A/cm2. Consequently, the addition of zinc oxide during friction stirring showed a remarkable improvement in corrosion resistance with Icorr of 0.094 9 106 A/cm2. Future studies are planned on these lines.

INTRODUCTION Light-weight materials like aluminum and its alloys find huge applications in automobile, aircraft, and marine sectors due to their high specific strength, good formability and corrosion resistance. In recent years, aluminum metal matrix composites (AMMC) have been gradually replacing the use of aluminum and its alloys. The newly developed AMMC possesses specific properties like high strength, high Young’s modulus, wear, fatigue and creep. Such composites can be produced by various traditional processes such as liquid metallurgy, powder metallurgy and mechanical alloy. Liquid metallurgy is characterized by particle clustering and unavoidable casting defects, which degrade the mechanical properties.1 On the other hand, the powder metallurgy route encounters porosity, which

(Received May 6, 2020; accepted July 31, 2020)

directly affects the tensile properties of the material.2 Also, the AMMC manufactured via mechanical alloying is often accompanied by a significant loss of ductility.3 During the last decade, the friction stir process (FSP) has been successful in overcoming the problems concomitant with the aforementioned methods.4,5 In FSP, matrix and reinforcement materials are worked under varying thermo-mechanical conditions by