Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys

The heterogeneous nature of microstructure in most as-cast alloys has created the unique properties for an ally before heat treatments. The scanty nature of scholarly articles on the effect of heat treatments on the hardness of new alloys produced from recycled aluminium alloys prompts this investig...

Full description

Saved in:
Bibliographic Details
Main Authors: Kazeem, A. B., Badarulzaman, N. A., Wan Ali, W. F. F.
Format: Article
Published: Penerbit Akademia Baru 2019
Subjects:
Online Access:http://eprints.utm.my/id/eprint/88796/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.utm.88796
record_format eprints
spelling my.utm.887962020-12-29T04:25:34Z http://eprints.utm.my/id/eprint/88796/ Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys Kazeem, A. B. Badarulzaman, N. A. Wan Ali, W. F. F. TJ Mechanical engineering and machinery The heterogeneous nature of microstructure in most as-cast alloys has created the unique properties for an ally before heat treatments. The scanty nature of scholarly articles on the effect of heat treatments on the hardness of new alloys produced from recycled aluminium alloys prompts this investigation. In this work, we upgraded from 3 series to 7 series alloys to form a new material. Previous attempts were also silent on the Alcao Green Letter specifications of the 7 series alloys, hence producing a 7475 alloy that may not be within the Alcao specifications. This paper presents the result of preliminary studies on new experimental X7475 Al-alloy that was produced per Alcoa Green Letter specifications, with variations of Zn (4.0 - 5.0 wt.%), Mg (1.00 - 1.50 wt.%) and Mn (0.025 - 0.075 wt.%), then subjected to microhardness probe under a load of 490.3mN (0.05Hv) and 10sec duration after isothermal and isochronous “O”, T4 and T6 heat treatments. Heating and cooling rates were controlled during heat treatment processes to investigate the effects on the formation of the MgZn2 and other precipitates on the mechanical properties of the alloy. Peak obtainable hardness value of 140.45 Hv and 134.32 Hv are attained within the T6 and T4 conditions in an alloy of 4% and 5% Zn respectively. The increase in wt.% of Zn favours mechanical properties while reverse is the case for Manganese. This result is an indication of the load bearing capacity of our alloy. It has also demonstrated the success in upgrading the 3 series to 7 series alloys from secondary materials. However, the result could be improved on after composition, heat treatments and production route optimization. Penerbit Akademia Baru 2019 Article PeerReviewed Kazeem, A. B. and Badarulzaman, N. A. and Wan Ali, W. F. F. (2019) Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 55 (2). pp. 233-239. ISSN 2289-7879
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Kazeem, A. B.
Badarulzaman, N. A.
Wan Ali, W. F. F.
Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys
description The heterogeneous nature of microstructure in most as-cast alloys has created the unique properties for an ally before heat treatments. The scanty nature of scholarly articles on the effect of heat treatments on the hardness of new alloys produced from recycled aluminium alloys prompts this investigation. In this work, we upgraded from 3 series to 7 series alloys to form a new material. Previous attempts were also silent on the Alcao Green Letter specifications of the 7 series alloys, hence producing a 7475 alloy that may not be within the Alcao specifications. This paper presents the result of preliminary studies on new experimental X7475 Al-alloy that was produced per Alcoa Green Letter specifications, with variations of Zn (4.0 - 5.0 wt.%), Mg (1.00 - 1.50 wt.%) and Mn (0.025 - 0.075 wt.%), then subjected to microhardness probe under a load of 490.3mN (0.05Hv) and 10sec duration after isothermal and isochronous “O”, T4 and T6 heat treatments. Heating and cooling rates were controlled during heat treatment processes to investigate the effects on the formation of the MgZn2 and other precipitates on the mechanical properties of the alloy. Peak obtainable hardness value of 140.45 Hv and 134.32 Hv are attained within the T6 and T4 conditions in an alloy of 4% and 5% Zn respectively. The increase in wt.% of Zn favours mechanical properties while reverse is the case for Manganese. This result is an indication of the load bearing capacity of our alloy. It has also demonstrated the success in upgrading the 3 series to 7 series alloys from secondary materials. However, the result could be improved on after composition, heat treatments and production route optimization.
format Article
author Kazeem, A. B.
Badarulzaman, N. A.
Wan Ali, W. F. F.
author_facet Kazeem, A. B.
Badarulzaman, N. A.
Wan Ali, W. F. F.
author_sort Kazeem, A. B.
title Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys
title_short Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys
title_full Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys
title_fullStr Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys
title_full_unstemmed Effect of isothermal heat treatment on hardness of x7475 alumoinium alloys
title_sort effect of isothermal heat treatment on hardness of x7475 alumoinium alloys
publisher Penerbit Akademia Baru
publishDate 2019
url http://eprints.utm.my/id/eprint/88796/
_version_ 1687393623174283264
score 13.209306