title: Tensile properties of Ti-6Al-4V discs produced by open die powder compact forging of pre-alloyed HDH powders

authors: Raynova, Stiliana (Stella) Rousseva

subjects: Forging

abstract: Open die powder compact forging was employed for consolidation of Ti-6Al-4V(wt.%) powders which were produced by a hydride-dehydride (HDH) process. The powders were initially warm-compacted into cylindrical shapes. Induction heating was used for preheating the compacts prior to forging into plates. The effect of the forging parameters such as temperature and pre-sintering time on the microstructure and tensile properties of the forged plates were studied. Porosity and the alpha-beta phase distribution were investigated to enable a better understanding of their effect on the fracture behaviour of the tensile tested specimens. The fracture surfaces of the broken tensile specimens were analysed using Scanning Electron Microscopy (SEM) to find the correlation between microstructure, residual porosity and fracture behaviour. A combination of high ultimate tensile strength of over 1200MPa and a good ductility reflected by an elongation to fracture of around 10% was achieved in some of the forged discs.

text: Tensile properties of Ti-6Al-4V discs produced by open die powder compact forging of pre-alloyed HDH powders Open die powder compact forging was employed for consolidation of Ti-6Al-4V(wt.%) powders which were produced by a hydride-dehydride (HDH) process. The powders were initially warm-compacted into cylindrical shapes. Induction heating was used for preheating the compacts prior to forging into plates. The effect of the forging parameters such as temperature and pre-sintering time on the microstructure and tensile properties of the forged plates were studied. Porosity and the alpha-beta phase distribution were investigated to enable a better understanding of their effect on the fracture behaviour of the tensile tested specimens. The fracture surfaces of the broken tensile specimens were analysed using Scanning Electron Microscopy (SEM) to find the correlation between microstructure, residual porosity and fracture behaviour. A combination of high ultimate tensile strength of over 1200MPa and a good ductility reflected by an elongation to fracture of around 10% was achieved in some of the forged discs.

year: 2012

title: Supplementary notes for 2024 Moana Oceania NZ soil judging handbook

authors: Lowe, David J.

abstract: These supplementary maps and tables were compiled by David J. Lowe to accompany and enhance the NZ soil judging handbook prepared for the 2024 Moana Oceania Soil Judging competition held in the Rotorua region 29 November-1 December 2024 (prior to the joint NZSSS and SSA soils conference 2-5 December 2024 in Rotorua). They include maps of volcanic centres and explosively erupted products in North Island, the general soil pattern for tephra-derived soils, the main rhyolitic tephras deposited in the Rotorua-Tarawera region over the past c. 25,400 years, and the distribution of Taupo tephra (c. 232 AD), Kaharoa tephra (c. 1314 AD) and Tarawera tephra (10 June 1886 AD). Notes on the development of the Mamaku Plateau via ignimbrite emplacement and erosion and on the nature and formation of the nanoclay, allophane, are also included.

text: Supplementary notes for 2024 Moana Oceania NZ soil judging handbook These supplementary maps and tables were compiled by David J. Lowe to accompany and enhance the NZ soil judging handbook prepared for the 2024 Moana Oceania Soil Judging competition held in the Rotorua region 29 November-1 December 2024 (prior to the joint NZSSS and SSA soils conference 2-5 December 2024 in Rotorua). They include maps of volcanic centres and explosively erupted products in North Island, the general soil pattern for tephra-derived soils, the main rhyolitic tephras deposited in the Rotorua-Tarawera region over the past c. 25,400 years, and the distribution of Taupo tephra (c. 232 AD), Kaharoa tephra (c. 1314 AD) and Tarawera tephra (10 June 1886 AD). Notes on the development of the Mamaku Plateau via ignimbrite emplacement and erosion and on the nature and formation of the nanoclay, allophane, are also included.

year: 2024-11-20

title: Cultural Justice and Ethics

authors: Nikora, Linda Waimarie

subjects: Maori

abstract: Contains the complete proceedings of the Cultural Justice and Ethics symposium held within the Annual Conference of the New Zealand Psychological Society, Wellington, 23rd-24th August, 1993. The responsibility for ensuring that the discipline of psychology is culturally just, is not only that of Maori or some other non-dominant group - the responsibility belongs to all involved in psychology. This collection of papers is about questioning and challenging the psychology that has been adopted from other settings. It is about nurturing and valuing the development of local and indigenous psychologies. It is about developing psychological tools and methods of application that are culturally compatible. It is an invitation to become excited about and instrumental in building a profession and practice in Aotearoa, for Aotearoa.

text: Cultural Justice and Ethics Contains the complete proceedings of the Cultural Justice and Ethics symposium held within the Annual Conference of the New Zealand Psychological Society, Wellington, 23rd-24th August, 1993. The responsibility for ensuring that the discipline of psychology is culturally just, is not only that of Maori or some other non-dominant group - the responsibility belongs to all involved in psychology. This collection of papers is about questioning and challenging the psychology that has been adopted from other settings. It is about nurturing and valuing the development of local and indigenous psychologies. It is about developing psychological tools and methods of application that are culturally compatible. It is an invitation to become excited about and instrumental in building a profession and practice in Aotearoa, for Aotearoa.

year: 1993