title: Work hardening of quaternary powder metallurgy Ti alloys

authors: Al-hajiri, M

abstract: The concurrent addition of Al as α stabiliser and Nb and Cu or Mn as β stabilisers was used to design new powder metallurgy quaternary Ti alloys and investigate their manufacturability and consequent performance. It is found that the powder blend's compressibility decreases with the total amount of alloying elements due to the characteristics of the powders used. Consequently, the sintered density of the quaternary Ti alloys decreases and slightly higher values are achieved if Mn instead of Cu is used, despite the higher diffusivity of Cu at the sintering temperature. The quaternary Ti alloys are characterised by a lamellar microstructure comprising α grain boundaries and α+β lamellae where the amount and type of alloying elements determine the coarseness of the microstructural features. This results in stronger and harder but less ductile quaternary Ti alloys for higher alloying elements contents and for stronger β stabilisers, although of their overall elastoplastic behaviour. Because of their lamellar microstructure, the quaternary Ti alloys show similar deformation behaviour but the actual work hardening rate is governed by the fineness of the microstructure.

text: Work hardening of quaternary powder metallurgy Ti alloys The concurrent addition of Al as α stabiliser and Nb and Cu or Mn as β stabilisers was used to design new powder metallurgy quaternary Ti alloys and investigate their manufacturability and consequent performance. It is found that the powder blend's compressibility decreases with the total amount of alloying elements due to the characteristics of the powders used. Consequently, the sintered density of the quaternary Ti alloys decreases and slightly higher values are achieved if Mn instead of Cu is used, despite the higher diffusivity of Cu at the sintering temperature. The quaternary Ti alloys are characterised by a lamellar microstructure comprising α grain boundaries and α+β lamellae where the amount and type of alloying elements determine the coarseness of the microstructural features. This results in stronger and harder but less ductile quaternary Ti alloys for higher alloying elements contents and for stronger β stabilisers, although of their overall elastoplastic behaviour. Because of their lamellar microstructure, the quaternary Ti alloys show similar deformation behaviour but the actual work hardening rate is governed by the fineness of the microstructure.

year: 2024-04-01

title: DVD Review: Move it

authors: Cheesman, Sue

subjects: dance

abstract: DVD review of Move it (Dance class choreographed and taught by Anita Hutchins).

text: DVD Review: Move it DVD review of Move it (Dance class choreographed and taught by Anita Hutchins).

year: 2007

title: Early childhood teachers partnering with teacher educators to connect children to taiao (the natural world) through place-based learning

authors: Postlewaight, Gillian

abstract: Initial cycles of an action research project brought together local early childhood (ECE) teachers, and tertiary ECE teacher educators, to explore possible uses of the Ōtātara Outdoor Learning Centre (ŌOLC), adjoining the campus at Hawke’s Bay’s Te Aho a Maui Eastern Institute of Technology (EIT), Napier, New Zealand. EIT is situated below Ōtātara Pa, a historic site that holds cultural and historical significance for local Māori, specifically Ngati Pārau Hapū and Ngati Kahungunu Iwi. Education in New Zealand is underpinned by commitment to Te Tiriti o Waitangi (Treaty of Waitangi), ensuring that the principles; partnership, participation and protection of kaupapa Māori are supported through bicultural curricula. Māori holistic perspectives strengthen this focus and shifting understanding that place-based learning authenticates environmental approaches to education and cultural knowledge. During the first meeting, participants walked the hillside site and shared group discussions. From these conversations, the teachers identified three main themes: establishing connections between children and the physical place, new opportunities for teacher learning and challenges to implementing spontaneous teaching and learning in this unique environment. Future cycles of the research will focus on workshops for teachers to address these themes for teachers’ working with children in the space.

text: Early childhood teachers partnering with teacher educators to connect children to taiao (the natural world) through place-based learning Initial cycles of an action research project brought together local early childhood (ECE) teachers, and tertiary ECE teacher educators, to explore possible uses of the Ōtātara Outdoor Learning Centre (ŌOLC), adjoining the campus at Hawke’s Bay’s Te Aho a Maui Eastern Institute of Technology (EIT), Napier, New Zealand. EIT is situated below Ōtātara Pa, a historic site that holds cultural and historical significance for local Māori, specifically Ngati Pārau Hapū and Ngati Kahungunu Iwi. Education in New Zealand is underpinned by commitment to Te Tiriti o Waitangi (Treaty of Waitangi), ensuring that the principles; partnership, participation and protection of kaupapa Māori are supported through bicultural curricula. Māori holistic perspectives strengthen this focus and shifting understanding that place-based learning authenticates environmental approaches to education and cultural knowledge. During the first meeting, participants walked the hillside site and shared group discussions. From these conversations, the teachers identified three main themes: establishing connections between children and the physical place, new opportunities for teacher learning and challenges to implementing spontaneous teaching and learning in this unique environment. Future cycles of the research will focus on workshops for teachers to address these themes for teachers’ working with children in the space.

year: 2023-04-27