Publications

CORTIE, MB 1991, 'THE IRREPRESSIBLE RELATIONSHIP BETWEEN THE PARIS LAW PARAMETERS', ENGINEERING FRACTURE MECHANICS, vol. 40, no. 3, pp. 681-682.
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The high apparent correlation between the parameters C and m in the Paris law for Stage II fatigue-crack growth has been shown to be an artifact produced by the logarithmic and mathematical methods used to represent fatigue data. Although the correlation

CORTIE, MB & MAVROCORDATOS, CE 1991, 'THE DECOMPOSITION OF THE BETA PHASE IN THE COPPER-TIN SYSTEM', METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 22, no. 1, pp. 11-18.
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The heat treatment of beta-phase alloys in the copper-tin system has been of technological significance for over 2000 years but has hardly been investigated by metallurgists. In this paper, the isothermal decomposition of the beta phase has been examine

CORTIE, MB & POTGIETER, JH 1991, 'THE EFFECT OF TEMPERATURE AND NITROGEN-CONTENT ON THE PARTITIONING OF ALLOY ELEMENTS IN DUPLEX STAINLESS-STEELS', METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 22, no. 10, pp. 2173-2179.
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The partitioning of the alloy elements chromium, nickel, and molybdenum that occurs in conventional duplex stainless steels has been measured for various nitrogen contents and annealing temperatures. The experimental results have been combined with data

MCCREDIE, GM, PHILLIPS, MR & MOON, AR 1991, 'OPTIMIZATION OF THINNING RATES IN AN ARGON ION-BEAM THINNER', REVIEW OF SCIENTIFIC INSTRUMENTS, vol. 62, no. 7, pp. 1855-1856.
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A simple and inexpensive feedback circuit has been devised that regulates the gas flow in an argon ion gun system and thus optimizes the specimen thinning rate. The circuit is easily adapted to suit a broad range of similar applications.

MOON, AR & PHILLIPS, MR 1991, 'DEFECT CLUSTERING IN H,TI-ALPHA-AL2O3', JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, vol. 52, no. 9, pp. 1087-1099.
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In order to investigate the defect structure of Ti alpha-Al2O3, protons were incorporated into aluminium oxide single crystals doped with tetravalent titanium. This produced a set of sharp bands in the i.r. spectrum with stretching frequencies around 33

MOON, AR & PHILLIPS, MR 1991, 'IRON AND SPINEL PRECIPITATION IN IRON-DOPED SAPPHIRE', JOURNAL OF THE AMERICAN CERAMIC SOCIETY, vol. 74, no. 4, pp. 865-868.
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Single crystals of Al2O3 containing 0.5 wt% Fe were exposed to low po2 atmospheres at 1500-degrees-C to produce precipitate phases. Analytical TEM identified the precipitate phases as spinel (hercynite) and iron, with the following orientation relations

MOON, AR & PHILLIPS, MR 1991, 'TITANIA PRECIPITATION IN SAPPHIRE CONTAINING IRON AND TITANIUM', PHYSICS AND CHEMISTRY OF MINERALS, vol. 18, no. 4, pp. 251-258.
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Titania, TiO2, precipitation in natural blue sapphire (Fe, Ti alpha-Al2O3) has been investigated using high resolution and analytical transmission electron microscopy. The structure and habit of the TiO2 precipitate depends on both the Ti4+ concentrati

PHILLIPS, MR & DARCIE, TE 1991, 'NUMERICAL-SIMULATION OF CLIPPING-INDUCED DISTORTION IN ANALOG LIGHTWAVE SYSTEMS', IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 3, no. 12, pp. 1153-1155.
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Clipping is a fundamental source of distortion in subcarrier multiplexed lightwave systems. We numerically simulate the clipping nonlinear distortion for typical CATV systems. The simulation results agree well with the Saleh clipping limit for effectiv

PHILLIPS, MR, DARCIE, TE, MARCUSE, D, BODEEP, GE & FRIGO, NJ 1991, 'NONLINEAR DISTORTION GENERATED BY DISPERSIVE TRANSMISSION OF CHIRPED INTENSITY-MODULATED SIGNALS', IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 3, no. 5, pp. 481-483.
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Transmission through dispersive and nonlinear optical fibers produces distortion in subcarrier intensity-modulated systems. Analytic expressions for second- and third-order distortion are derived using the time-domain form of the field envelope wave equ

POTGIETER, JH & CORTIE, MB 1991, 'DETERMINATION OF THE MICROSTRUCTURE AND ALLOY ELEMENT DISTRIBUTION IN EXPERIMENTAL DUPLEX STAINLESS-STEELS', MATERIALS CHARACTERIZATION, vol. 26, no. 3, pp. 155-165.
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An investigation was carried out on the microstructure and distribution of alloy elements in a series of experimental duplex stainless steels containing up to 35% chromium. It was found that the proportion of austenite and ferrite present could be accur

UNG, AT, BISHOP, R, CRAIG, DC, DANCE, IG & SCUDDER, ML 1991, 'STABILITY OF THE HELICAL TUBULAND INCLUSION LATTICE', JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, vol. 15, no. 15, pp. 1012-1014.
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UNG, AT, SCUDDER, ML, DANCE, IG & BISHOP, R 1991, 'GUEST CONTROL OF DIOL INCLUSION HOST LATTICES', ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, vol. 201, pp. 327-ORGN.