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research-article

An experimental survey of fracture toughness for nano/ultra-fine grained Al5052/Cu multi-layered composite processed by the accumulative roll bonding

[+] Author and Article Information
Davood Rahmatabadi

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
davood.rahmatabadi@yahoo.com

Bijan Mohammadi

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
bijan_mohammadi@iust.ac.ir

Ramin Hashemi

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
rhashemi@iust.ac.ir

Taghi Shojaee Shojaee

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
ta_shojaee@cmps2.iust.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4040542 History: Received April 22, 2017; Revised June 08, 2018

Abstract

In this study, ultra-fine grained Al5052/Cu multi-layered composite is produced by accumulative roll bonding (ARB) and fracture properties are studied using plane stress fracture toughness. The fracture toughness is investigated for the unprocessed specimens, primary sandwich and first, 2end and 3rd cycles of ARB process by ASTM E561 and compact tension specimens. Also, the microstructure and mechanical properties are investigated using optical microscopy, scanning electron microscopy, uniaxial tensile tests, and microhardness measurements. The value of plane stress fracture toughness for the ultra-fine grained Al5052/Cu composite increased by increasing the number of ARB cycles, continuously from the primary sandwich to end of the 3rd cycle, and the maximum value of 59.1 MPa.m1/2 is obtained that it is about 2.77 and 4.05 more than Al5052 and pure Cu (unprocessed specimens). This indicates that ARB process and the addition of copper to aluminum alloy can increase the value of fracture toughness to more than three times. The results showed that by increasing the ARB cycles, the thickness of copper layers reduced and after the 5th cycle, the good uniformity of Cu layers achieved. By increasing the number of ARB cycles, the microhardness of both aluminum and copper layers are significantly increased. The tensile strength of the sandwich is enhanced continually, and the maximum value of 566.5 MPa is achieved.

Copyright (c) 2018 by ASME
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