Coating of 6028 Aluminum Alloy Using Aluminum Piston Alloy and Al-Si Alloy-Based Nanocomposites Produced by the Addition
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ALUMINUM and its alloys are widely used as constructional materials of special importance. They have been found to be well suited for applications that require corrosion resistance, high strength-to-weight ratio, good electric, and thermal conductivity. AA 6028 aluminum alloy is one of the most important structural alloys. It can be used as extrusion product and automotive body sheet, which have the advantages of good weldability, corrosion resistance, and immunity to stress corrosion cracking.[1] However, aluminum base materials have poor surface properties, which restrict HASHEM F. EL-LABBAN, Associate Professor, is with the Production Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt. M. ABDELAZIZ, Associate Professor, is with the Advanced Materials Department, Composite Material Lab, CMRDI, Cairo, Egypt. ESSAM R.I. MAHMOUD, Assistant Professor, is with the Welding and NDT Laboratory, Manufacturing Technology Department, Central Metallurgical Research and Development Institute (CMRDI), Cairo, Egypt. Contact e-mail: [email protected] Manuscript submitted September 26, 2013 METALLURGICAL AND MATERIALS TRANSACTIONS B
their applications in some fields. One possibility to increase durability and performance of the aluminum alloys for the applications in which high wear resistance is required, is to coat its surface with materials having a high degree of wear resistance.[2–4] Selecting coating materials remains one of the most critical factors in realizing the best properties from the resultant coated aluminum alloys. The properties of such coatings must be very close to that of the base metal, except of that of the wear resistance.[5,6] Al-Si alloys that have Si content near eutectic composition is considered one of the unique aluminum alloys that have high wear resistance. This high wear resistance can be attributed to the presence of hard silicon particles distributed throughout the matrix.[7,8] Furthermore, it was indicated that Si additions improved seizure resistance with the optimum Si content corresponding to the near eutectic value. Moreover, the eutectic Al-Si alloys have high strength, low thermal expansion coefficient, excellent castability (high fluidity), and high corrosion resistance.[9] These properties lead to considering Al-Si eutectic alloys as a good candidate as coating materials.
Aluminum-based composites exhibit superior wear resistance, strength-to-weight ratio and strength-to-cost ratio when compared to equivalent monolithic commercial alloys.[10] Among the various reinforcing particles, TiB2 and Al3Ti are particularly attractive because it exhibit high elastic modulus and hardness as well as good thermal conductivity. Compared to Al-SiC, the Al-TiB2 MMC has better elevated temperature properties.[11] Aluminum-based reinforced with TiB2 and/or Al3Ti exhibits improved mechanical and corrosion properties (especially to hydrochloric and hydrofluoric acids[12]), which find relevance in automobiles and aerospace materials for structural applications and als
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