D
D. H. St John
Researcher at University of Queensland
Publications - 63
Citations - 1990
D. H. St John is an academic researcher from University of Queensland. The author has contributed to research in topics: Alloy & Grain size. The author has an hindex of 19, co-authored 63 publications receiving 1794 citations.
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The anodic dissolution of magnesium in chloride and sulphate solutions
TL;DR: In this article, the electrochemical behavior of magnesium was studied in representative chloride and sulphate solutions including NaCl, Na2SO4, NaOH and their mixed solutions, HCl, and H2SO 4: (1) by measuring electrochemical polarisation curves, (2) by using electrochemical impedance spectroscopy (EIS), and (3) by simultaneous measurement of hydrogen gas evolution and measurement of magnesium dissolution rates using ICPEAS.
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Effects of boron on microstructure in cast titanium alloys
TL;DR: In this paper, trace additions of boron to commercial purity titanium result in significant microstructural changes, including the promotion of dendritic growth and refinement in both the prior-β and α-grain size.
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Formation of defect bands in high pressure die cast magnesium alloys
TL;DR: In this article, the effect of varied casting conditions on casting integrity and the appearance of the bands of porosity or segregation in high pressure die castings of thin-walled magnesium alloys is investigated.
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A simple prediction of the rate of the peritectic transformation
D. H. St John,L.M. Hogan +1 more
TL;DR: In this article, the rate of a peritectic transformation is determined by the diffusion coefficient in the per-itectic product phase and by the form of the phase diagram features, which can be classified on the basis of phase diagram form to permit easy prediction of relative rate constants.
Journal Article
Development of a non intrusive heat transfer coefficient gauge and its application to high pressure die casting
TL;DR: In this article, a robust sensor suitable for determining heat flow and heat transfer coefficient in high pressure die casting is presented, together with a design methodology for the sensor and the conclusions of this analysis.