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|Title: ||Comparison of dynamic mechanical properties of non-superheated and superheated A357 alloys|
|Authors: ||Mazlee, Mohd. Noor|
Shamsul Baharin, Jamaludin
|Keywords: ||A357;Melt superheat treatment;Grain boundary damping;Dynamic mechanical analyzer (DMA)|
|Issue Date: ||1-Mar-2010|
|Publisher: ||Slovak Academy of Sciences|
|Citation: ||Kovové materiály/Metallic Materials, vol. 48, 2010, pages 1-6|
|Abstract: ||The influence of superheat treatment on the microstructure and dynamic mechanical properties
of A357 alloys has been investigated. The study of microstructure was performed by optical
microscope. Dynamic mechanical properties (storage modulus, loss modulus and damping
capacity) were measured by the dynamic mechanical analyzer (DMA). Microstructure showed
coarser and angular eutectic Si particles with larger α-Al dendrites in non-superheated A357
alloy. In contrast, finer and rounded eutectic Si particles together with smaller and preferably
oriented α-Al dendrites have been observed in superheated A357 alloy. Dynamic mechanical
properties showed an increasing trend of loss modulus and damping capacity, meanwhile
a decreasing trend of storage modulus at elevated temperatures for superheated and nonsuperheated
A357 alloys. The significant improvement of damping capacities has been observed
at lower temperatures range (50 to 277◦C) and higher temperatures range (278 to 380◦C) in
non-superheated A357 alloy and superheated A357 alloy, respectively. The high damping capacity
of superheated A357 alloy has been ascribed to the grain boundary damping at elevated
|Description: ||Link to publisher's homepage at http://kovmat.sav.sk/covers.php|
|Appears in Collections:||Che Mohd Ruzaidi Ghazali, Assoc. Prof.|
Shamsul Baharin Jamaludin, Prof. Dr.
Mazlee Mohd Noor, Dr.
School of Materials Engineering (Articles)
Kamarudin Hussin, Brig. Jen. Datuk Prof. Dr.
Zul Azhar Zahid Jamal, Prof. Dr.
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