Effect of mechtrode rotational speed on friction surfacing of AA2024 on AA1050 substrate

Abstract

The present work investigated the fabrication of two-layered AA1050-AA2024 material by friction surfacing process. The effect of rotational speed of a consumable rod was evaluated on the microstructure, macrotexture, and tribological characteristics of AA1050-AA2024 bimetal. In this regard, AA2024 aluminum alloy was friction surfaced on AA1050 substrate by three rotational speeds of 1000, 800, and 600rpm, constant axial feeding rate of 125mm/min, and traverse speed of 75mm/min. The AA2024 cladded material was characterized by optical microscopy, scanning electron microscopy, texture analysis, and wear test. As observed, the shear and recrystallization texture of low intensity was created in the clad layer. The precipitation hardening and grain refinement hardening are the main strengthening mechanism in the AA2024 clad layer. The AA2024 clad layer with the maximum shear strength of 189.64MPa, wear rate of 0.0012mg/m, and coefficient of friction of 0.52 was applied on AA1050 using friction surfacing. Given the excellent corrosion resistant and formability of AA1050 substrate, friction surfacing of AA2024 with rotational speed, traverse speed, and axial feeding rate of 1000rpm, 125mm/min, and 75mm/min, respectively, resulted in the formation of AA1050-AA2024 bimetal with a reduction in wear rate, and an increase in hardness of the clad layer by factors of 2.83 and 3.37 compared to substrate, respectively.