Elimination of porosity in bulk metallic glass castings using hot isostatic pressing

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Title: Elimination of porosity in bulk metallic glass castings using hot isostatic pressing
Authors: Srivastava, Amit P.
Tong, Mingming
Ștefanov, Tatiana
Browne, David J.
Permanent link: http://hdl.handle.net/10197/8706
Date: 15-Jul-2017
Abstract: This study presents design and implementation of a systematic method to remove the pores in as-cast bulk metallic glass using hot isostatic pressing, without changing the amorphous structure of the samples. The supercooled liquid region of Zr44Cu40Al8Ag8 was characterized using differential scanning calorimetry and dynamic mechanical analysis. This enabled informed choice of the range of hot isostatic pressing process variables likely to result in successful reduction of the porosity in the glassy alloy. The operating pressure in hot isostatic press processing was relatively less influential than either the temperature or the dwell time in controlling the porosity. It was shown that the dwell time should be longer than the average relaxation time in the glass transition range. With the specific bulk amorphous alloy under study, the optimized temperature, pressure and dwell time are 475 °C, 50 MPa and 3 min, respectively. Excess dwell times will result in crystallization.                        
Funding Details: Enterprise Ireland
Type of material: Journal Article
Publisher: Elsevier
Journal: Journal of Non-Crystalline Solids
Volume: 468
Start page: 5
End page: 11
Copyright (published version): 2017 Elsevier
Keywords: Hot isostatic pressingBulk amorphous alloysPorosityDesign of experimentsSupercooled liquid
DOI: 10.1016/j.jnoncrysol.2017.04.007
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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