ORCID Profile
0000-0002-9189-6011
Current Organisations
CSIRO
,
CSIRO Australian Manufacturing and Materials Precinct
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Wiley
Date: 02-2014
Publisher: Wiley
Date: 03-2013
Publisher: Elsevier BV
Date: 1990
Publisher: Springer Science and Business Media LLC
Date: 1991
DOI: 10.1007/BF00549183
Publisher: Elsevier BV
Date: 04-1998
Publisher: Elsevier BV
Date: 10-2002
Publisher: Elsevier BV
Date: 10-1995
Publisher: Elsevier BV
Date: 11-2001
Publisher: Elsevier BV
Date: 1992
Publisher: Informa UK Limited
Date: 09-2008
Publisher: Wiley
Date: 1996
Publisher: Elsevier BV
Date: 08-2000
Publisher: Springer Science and Business Media LLC
Date: 12-1989
DOI: 10.1007/BF00544502
Publisher: Wiley
Date: 20-12-2005
Publisher: Elsevier BV
Date: 05-2000
Publisher: Trans Tech Publications, Ltd.
Date: 04-2009
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.618-619.63
Abstract: Friction stir processing (FSP) combines frictional heating and severe plastic deformation to produce microstructural modification, either locally targeted at the near-surface regions or through the bulk, of metallic components fabricated by conventional processing routes. In this paper, we highlight the capabilities of this process by applying it to a high-pressure die cast Al-Si-Mg-(Cu) alloy and examining the resulting microstructure and mechanical properties.
Publisher: Elsevier BV
Date: 02-2017
Publisher: Trans Tech Publications, Ltd.
Date: 06-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.654-656.1211
Abstract: Commercially pure cast aluminium was subjected to equal channel angular pressing (ECAP) at room temperature using routes A, Bc and C. Microhardness distribution maps were produced on sections of extruded billets after one, two, three and four passes for each of the processing routes. It was found that the mean hardness increased significantly already after the first pass. With subsequent passes, the hardness increase was smaller but the hardness distribution became narrower, indicating increasing homogeneity. For route Bc, a slight decrease in average hardness was observed after the fourth pass. The mean hardness after four passes was highest for the route C s le, followed by the route A and route Bc s les.
Publisher: Trans Tech Publications, Ltd.
Date: 04-2009
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.618-619.139
Abstract: Major research and development efforts both in CSIRO and elsewhere aim to develop processes for commercial production of low cost titanium powder. These processes could reduce the current cost of titanium, but the major savings are expected to come by enabling powder metallurgical processes which transform these powders into products. Powder metallurgical (PM) processes (e.g. CIP/HIP) are well established for discrete components, but technologies for continuous production of “mill” product are immature. New processes will be needed for the economic manufacture of mill product (e.g. sheet and tube) from the large quantities of low-cost powder which will become available when the emerging powder production processes enter commercial production. The paper will present a process for the production of commercial purity (CP) sheet by direct rolling of powder. It is novel in that it avoids both the use of binders and densification via batch sintering. A roll compacted green sheet is rapidly heated under a controlled atmosphere before being consolidated to nominally 100% density by hot rolling. Following conventional batch annealing, strip s les exhibit properties approaching those of commercial wrought sheet of an equivalent grade. In order to achieve this, a number of key variables including powder chemistry, morphology and particle packing, the roll compaction and hot rolling parameters needed to be understood and closely controlled.
Publisher: Elsevier
Date: 2018
Publisher: Elsevier BV
Date: 10-1998
Publisher: Wiley
Date: 04-1995
Publisher: Wiley
Date: 09-1989
Publisher: Wiley
Date: 02-1988
Publisher: Elsevier BV
Date: 07-2010
Publisher: Trans Tech Publications, Ltd.
Date: 06-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.654-656.1428
Abstract: Friction stir processing (FSP) was performed on AA 7075-T6, a heat treatable high strength Al-Zn-Mg-Cu alloy. The two main FSP parameters, the tool rotational and travel speed, were varied systematically in order to understand their influence on the microstructure and mechanical properties of the processed zone. At a given rotational speed, increasing the travel speed increased the microhardness of the nugget (stir) zone for a given travel speed there appeared to be an optimum rotational speed which resulted in the highest microhardness. The range of FSP parameters used did not significantly influence the nugget zone grain size. It is suggested that the observed mechanical properties are a result of the complex interactions between the FSP thermo-mechanical effects and the processes of dissolution, coarsening and re-precipitation of the strengthening precipitates in this alloy.
Publisher: Elsevier
Date: 2010
Publisher: Elsevier BV
Date: 11-2006
Publisher: SPIE
Date: 09-08-2013
DOI: 10.1117/12.2026587
Publisher: SAE International
Date: 12-04-2011
DOI: 10.4271/2011-01-0477
Publisher: Springer Science and Business Media LLC
Date: 1990
Abstract: Results of crack growth observations on mica in water-containing environments are described. The study focuses on equilibrium crack states for reversed loading cycles, i.e., for initial propagation through virgin solid and subsequent retraction-repropagation through healed or misoriented-healed interfaces. Departures from these equilibrium states are manifest as steady-state forward or backward crack velocities at specific applied loads. The equilibria are thereby interpreted as quiescent, threshold configurations G = W E , with G the Griffith mechanical-energy-release rate and W E the Dupré work of adhesion, on crack velocity ( v-G ) diagrams. Generally, W E is found to decrease with concentration of water, in accordance with a Gibbs formalism. Hysteresis is observed in the forward-backward-forward crack propagation cycle, signifying a reduction in the adhesion energy on exposure of the open interface to environmental species prior to healing. This hysteresis is especially marked for those interfaces that are misoriented before healing, indicating that the structure of the underlying solid substrate as well as of the intervening fluid is an important consideration in the interface energetics. The equilibrium states for different environments can be represented on a simple energy-level diagram, as differences between thermodynamic end-point states: initial, closed-interface states refer to crystallographic bonding configurations ahead of the crack-tip adhesion zone final, open interface states refer to configurations behind the crack-tip zone. The significance of this diagram in relation to the fundamental atomic structure of interfaces in fracture and other adhesion geometries, including implications concerning kinetics, is discussed.
Publisher: Springer Science and Business Media LLC
Date: 1991
DOI: 10.1007/BF01130175
Publisher: Wiley
Date: 06-1991
Publisher: Trans Tech Publications, Ltd.
Date: 2016
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.838-839.214
Abstract: Friction stir processing (FSP) is a novel thermo-mechanical technique for modifying the microstructure of metals and alloys at targeted locations. In the present study, the microstructures and mechanical properties of friction stir processed Mg-9Al-1Zn (AZ91) alloy were evaluated. 4 mm thick sand cast AZ91 plates with a coarse dendritic microstructure and visible intermetallic phase were processed using single-pass FSP with different combinations of tool rotational and traverse speeds. Significant grain refinement ( μm), elimination of casting defects and the dissolution of intermetallic phase were observed at the stir zone (SZ) of all tested specimens. Microhardness tests showed increased microhardness along the SZ with a more uniform microhardness profile as compared to the regions outside the SZ. Mechanical properties evaluation using shear punch testing and subsequent microstructure analysis performed using scanning electron microscopy and microchemical analysis using Energy Dispersive Spectroscopy are discussed in this paper.
Publisher: Elsevier BV
Date: 02-2001
Location: Australia
Location: Australia
No related grants have been discovered for Sri Lathabai.