TY - JOUR
T1 - Effect of Direct Recycling Hot Press Forging Parameters on Mechanical Properties and Surface Integrity of AA7075 Aluminum Alloys
AU - Ruhaizat, Nasha Emieza
AU - Yusuf, Nur Kamilah
AU - Lajis, Mohd Amri
AU - Al-Alimi, Sami
AU - Shamsudin, Shazarel
AU - Tukiat, Ikhwan Shah Tisadi
AU - Zhou, Wenbin
N1 - Funding Information:
This research was funded by the Ministry of Higher Education (MOHE), Malaysia, which funded this project through the Fundamental Research Grant Schemes (FRGS/1/2019/TK09/UTHM/03/1) and monetary assistance by Universiti Tun Hussein Onn Malaysia and the UTHM Publisher’s Office via the Publication Fund E15216.
Funding Information:
The authors would like to express their deepest appreciation to the Ministry of Higher Education (MOHE), Malaysia for funding this project through the Fundamental Research Grant Schemes. Communication of this research is made possible through monetary assistance by Universiti Tun Hussein Onn Malaysia and the UTHM Publisher’s Office via the Publication Fund E15216. Additional support in terms of facilities was also provided by Sustainable Manufacturing and Recycling Technology, Advanced Manufacturing and Material Center (SMART-AMMC), Universiti Tun Hussein Onn Malaysia (UTHM).
Publisher Copyright:
© 2022 by the authors.
PY - 2022/9/20
Y1 - 2022/9/20
N2 - The current practice in aluminum recycling plants is to change the waste into molten metal through the conventional recycling (CR) manufacturing process. However, the CR technique is so energy-intensive that it also poses an indirect threat to the environment. This paper presents a study on meltless direct recycling hot press forging (DR-HPF) as an alternative sustainable approach that has fewer steps with low energy consumption, as well as preventing the generation of new waste. A laboratory experiment was conducted to study the mechanical properties and surface integrity of AA7075 aluminum alloy by employing a hot press forging (HPF) process under different temperatures (380, 430, and 480 °C) and holding times (0, 60, and 120 min). It was found that as the parameter increased, there was a positive increase in ultimate tensile strength (UTS), elongation to failure (ETF), density, and microhardness. The recycled chips exhibit the best mechanical properties at the highest parameters (480 °C and 120 min), whereas the UTS = 245.62 MPa and ETF = 6.91%, while surface integrity shows that the calculated microhardness and density are 69.02 HV and 2.795 g/cm3, respectively. The UTS result shows that the highest parameters of 480 °C and 120 min are comparable with the Aerospace Specification Metals (ASM) Aluminum AA7075-O standard. This study is a guide for machinists and the manufacturing industry to increase industry sustainability, to preserve the earth for future generations.
AB - The current practice in aluminum recycling plants is to change the waste into molten metal through the conventional recycling (CR) manufacturing process. However, the CR technique is so energy-intensive that it also poses an indirect threat to the environment. This paper presents a study on meltless direct recycling hot press forging (DR-HPF) as an alternative sustainable approach that has fewer steps with low energy consumption, as well as preventing the generation of new waste. A laboratory experiment was conducted to study the mechanical properties and surface integrity of AA7075 aluminum alloy by employing a hot press forging (HPF) process under different temperatures (380, 430, and 480 °C) and holding times (0, 60, and 120 min). It was found that as the parameter increased, there was a positive increase in ultimate tensile strength (UTS), elongation to failure (ETF), density, and microhardness. The recycled chips exhibit the best mechanical properties at the highest parameters (480 °C and 120 min), whereas the UTS = 245.62 MPa and ETF = 6.91%, while surface integrity shows that the calculated microhardness and density are 69.02 HV and 2.795 g/cm3, respectively. The UTS result shows that the highest parameters of 480 °C and 120 min are comparable with the Aerospace Specification Metals (ASM) Aluminum AA7075-O standard. This study is a guide for machinists and the manufacturing industry to increase industry sustainability, to preserve the earth for future generations.
KW - AA7075 aluminum alloy
KW - direct recycling
KW - hot press forging (HPF)
KW - mechanical properties
KW - solid-state recycling (SSR)
KW - surface integrity
UR - http://www.scopus.com/inward/record.url?scp=85140871552&partnerID=8YFLogxK
U2 - 10.3390/met12101555
DO - 10.3390/met12101555
M3 - Article
AN - SCOPUS:85140871552
VL - 12
JO - Metals
JF - Metals
IS - 10
M1 - 1555
ER -
