The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy

The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy

The solidification parameter of Elektron 21 magnesium alloys with various Ho concentrations were investigated using computer-aided cooling curve thermal analysis system, and the solidification microstructure and phase constitution of the investigated alloys were characterized by SEM, EDX, and XRD. T...

Full description

Saved in:
Bibliographic Details
Main Author: Shahizan, Nurul Raihan
Format: Thesis
Language:English
English
English
Published: 2018
Subjects:
TN600-799 Metallurgy
Online Access:http://eprints.uthm.edu.my/494/1/24p%20NURUL%20RAIHAN%20SHAHIZAN.pdf
http://eprints.uthm.edu.my/494/2/NURUL%20RAIHAN%20SHAHIZAN%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/494/3/NURUL%20RAIHAN%20SHAHIZAN%20WATERMARK.pdf
Tags: Add Tag
No Tags, Be the first to tag this record!
id my-uthm-ep.494
record_format uketd_dc
spelling my-uthm-ep.4942021-07-25T07:32:59Z The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy 2018-07 Shahizan, Nurul Raihan TN600-799 Metallurgy The solidification parameter of Elektron 21 magnesium alloys with various Ho concentrations were investigated using computer-aided cooling curve thermal analysis system, and the solidification microstructure and phase constitution of the investigated alloys were characterized by SEM, EDX, and XRD. The mechanical properties were also investigated comparatively. The Ho was selected due to the ability to develop new intermetallic phases together with Mg and have a positive potential to reflect the properties of Mg alloys. As the outcome from this study, the cooling parameter of Elektron 21 with lower addition Ho content, the nucleation and growth temperature of α-Mg in Elektron 21 magnesium alloy decreased, where the Ho changed the solution degree of Zn, which resulted in refinement of microstructure. The results of solidification parameters showed the addition of 0.083 and 0.16 wt. % Ho cause a decrease of the solidification temperature alloys, which lead to the grain size about 64.0 %, which being a most effective addition. The microstructure of the result indicated that the intermetallic phases in the Elektron 21 cast alloy consisted mainly of α-Mg matrix, Mg12Nd, Mg41Nd5, Mg3Gd and Mg3Nd phase. The lower addition of Ho consists of Mg-Zn-Ho phase appears in the cast alloys. However, after adding 0.5 to 3.0 wt. % Ho, the Mg-Zn-Ho phase was suppressed and the phase has earlier been mixed Mg2Ho and Mg3Ho phase. Moreover, the addition of 0.083 wt. % of Ho exhibited an excellent improvement of ultimate tensile strength, yield strength and hardness of 139.7 MPa, 105.62 MPa and 103.52 Hv, respectively. The solidification, microstructure and mechanical properties of Elektron 21 magnesium alloys influenced by the Ho concentration in the magnesium alloys; Elektron 21 with 0.083 wt.% Ho exhibited the refinement of microstructure and displayed the best properties compared to other alloys. 2018-07 Thesis http://eprints.uthm.edu.my/494/ http://eprints.uthm.edu.my/494/1/24p%20NURUL%20RAIHAN%20SHAHIZAN.pdf text en public http://eprints.uthm.edu.my/494/2/NURUL%20RAIHAN%20SHAHIZAN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/494/3/NURUL%20RAIHAN%20SHAHIZAN%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Faculty of Mechanical and Manufacturing Engineering
institution Universiti Tun Hussein Onn Malaysia
collection UTHM Institutional Repository
language English
English
English
topic TN600-799 Metallurgy
spellingShingle TN600-799 Metallurgy
Shahizan, Nurul Raihan
The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
description The solidification parameter of Elektron 21 magnesium alloys with various Ho concentrations were investigated using computer-aided cooling curve thermal analysis system, and the solidification microstructure and phase constitution of the investigated alloys were characterized by SEM, EDX, and XRD. The mechanical properties were also investigated comparatively. The Ho was selected due to the ability to develop new intermetallic phases together with Mg and have a positive potential to reflect the properties of Mg alloys. As the outcome from this study, the cooling parameter of Elektron 21 with lower addition Ho content, the nucleation and growth temperature of α-Mg in Elektron 21 magnesium alloy decreased, where the Ho changed the solution degree of Zn, which resulted in refinement of microstructure. The results of solidification parameters showed the addition of 0.083 and 0.16 wt. % Ho cause a decrease of the solidification temperature alloys, which lead to the grain size about 64.0 %, which being a most effective addition. The microstructure of the result indicated that the intermetallic phases in the Elektron 21 cast alloy consisted mainly of α-Mg matrix, Mg12Nd, Mg41Nd5, Mg3Gd and Mg3Nd phase. The lower addition of Ho consists of Mg-Zn-Ho phase appears in the cast alloys. However, after adding 0.5 to 3.0 wt. % Ho, the Mg-Zn-Ho phase was suppressed and the phase has earlier been mixed Mg2Ho and Mg3Ho phase. Moreover, the addition of 0.083 wt. % of Ho exhibited an excellent improvement of ultimate tensile strength, yield strength and hardness of 139.7 MPa, 105.62 MPa and 103.52 Hv, respectively. The solidification, microstructure and mechanical properties of Elektron 21 magnesium alloys influenced by the Ho concentration in the magnesium alloys; Elektron 21 with 0.083 wt.% Ho exhibited the refinement of microstructure and displayed the best properties compared to other alloys.
format Thesis
qualification_name Master of Philosophy (M.Phil.)
qualification_level Master's degree
author Shahizan, Nurul Raihan
author_facet Shahizan, Nurul Raihan
author_sort Shahizan, Nurul Raihan
title The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
title_short The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
title_full The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
title_fullStr The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
title_full_unstemmed The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
title_sort influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
granting_institution Universiti Tun Hussein Onn Malaysia
granting_department Faculty of Mechanical and Manufacturing Engineering
publishDate 2018
url http://eprints.uthm.edu.my/494/1/24p%20NURUL%20RAIHAN%20SHAHIZAN.pdf
http://eprints.uthm.edu.my/494/2/NURUL%20RAIHAN%20SHAHIZAN%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/494/3/NURUL%20RAIHAN%20SHAHIZAN%20WATERMARK.pdf
_version_ 1747830623876153344

Similar Items