title: Microstructure and mechanical properties of large size Ti-43Al-9V-0.2Y alloy pancake produced by pack-forging

authors: Su, Yongjun

subjects: A. Titanium aluminide

abstract: A pancake of Ti-43Al-9V-0.2Y (at.%) alloy with dimensions of ϕ480 mm × 46 mm was fabricated by pack-forging with a thick reduction of 80%. The as-forged Ti-43Al-9V-0.2Y alloy pancake has a duplex (DP) microstructure, which is composed of B2/α₂/γ lamellar colonies and massive B2 and γ phase regions distributed along the boundaries between the lamellar colonies. Different microstructures were obtained by heat treatment of samples cut from the as-forged Ti-43Al-9V-0.2Y alloy pancake. A fully lamellar (FL) structure consisting of B2/α₂/γ lamellar colonies was obtained after the heat treatment of 1350 °C/8 h. Tensile test results exhibited that the yield strength (YS) and ultimate tensile strength (UTS) of the alloy with DP microstructure were decreased from 680.7 MPa to 834.3 MPa at room temperature to 589.5 MPa and 693.1 MPa at 700 °C, respectively, and the elongation (δ) of the alloy with DP microstructure was increased from 1.99% at room temperature to 12.12% at 700 °C; the elongation (δ) of the alloy with FL microstructure was increased from 1.52% at room temperature to 85.84% at 800 °C.

text: Microstructure and mechanical properties of large size Ti-43Al-9V-0.2Y alloy pancake produced by pack-forging A pancake of Ti-43Al-9V-0.2Y (at.%) alloy with dimensions of ϕ480 mm × 46 mm was fabricated by pack-forging with a thick reduction of 80%. The as-forged Ti-43Al-9V-0.2Y alloy pancake has a duplex (DP) microstructure, which is composed of B2/α₂/γ lamellar colonies and massive B2 and γ phase regions distributed along the boundaries between the lamellar colonies. Different microstructures were obtained by heat treatment of samples cut from the as-forged Ti-43Al-9V-0.2Y alloy pancake. A fully lamellar (FL) structure consisting of B2/α₂/γ lamellar colonies was obtained after the heat treatment of 1350 °C/8 h. Tensile test results exhibited that the yield strength (YS) and ultimate tensile strength (UTS) of the alloy with DP microstructure were decreased from 680.7 MPa to 834.3 MPa at room temperature to 589.5 MPa and 693.1 MPa at 700 °C, respectively, and the elongation (δ) of the alloy with DP microstructure was increased from 1.99% at room temperature to 12.12% at 700 °C; the elongation (δ) of the alloy with FL microstructure was increased from 1.52% at room temperature to 85.84% at 800 °C.

year: 2013

title: A theory of mobile library service delivery.

authors: Saravani, Sarah-Jane

subjects: Capability development

abstract: Research indicates there is widespread acceptance that nomadicity of library users is a phenomenon that will continue to increase; however, mobile learning is a resource that relatively few academic libraries appear to be taking advantage of. This paper presents a model developed during an investigation using a grounded theory approach into factors that may contribute to the delivery of library services to mobile technologies. A sample of 42 professionally qualified library staff from the Australasian vocational education and training (VET) sector was investigated to determine how confident and capable library staff believed they were to respond to technology advancement challenges and the training and support required for that response. The resulting theoretical model explains the impact of mobile technologies on library services and highlights the complex factors contributing to mobile technology acceptance at both an organisational and individual level. The presence of a series of catalysing impacts forms a central core and their management can enable an organisation to move from a position of uncertainty to one where the consequences of mobile technologies have been normalised.

text: A theory of mobile library service delivery. Research indicates there is widespread acceptance that nomadicity of library users is a phenomenon that will continue to increase; however, mobile learning is a resource that relatively few academic libraries appear to be taking advantage of. This paper presents a model developed during an investigation using a grounded theory approach into factors that may contribute to the delivery of library services to mobile technologies. A sample of 42 professionally qualified library staff from the Australasian vocational education and training (VET) sector was investigated to determine how confident and capable library staff believed they were to respond to technology advancement challenges and the training and support required for that response. The resulting theoretical model explains the impact of mobile technologies on library services and highlights the complex factors contributing to mobile technology acceptance at both an organisational and individual level. The presence of a series of catalysing impacts forms a central core and their management can enable an organisation to move from a position of uncertainty to one where the consequences of mobile technologies have been normalised.

year: 2017

title: Research support in New Zealand University Libraries

authors: Howie, Jess

abstract: Researcher-facing librarians in New Zealand are providing guidance across more of the research lifecycle than ever before in response to an increasingly complex scholarly ecosystem. This research explored the development of research support through survey responses from all eight New Zealand University Libraries. From the responses it was possible to ascertain the level of services offered or planned in the four key areas of research impact, Research Data Management, scholarly communication and Kaupapa Māori research. Skills gaps and barriers to service development were also identified. Comparison with an earlier study revealed that research impact and Research Data Management services have developed well over the last 6 years. A good level of maturity was identified in scholarly communication services but support for Kaupapa Māori research was identified as an area for development. Barriers to service development included lack of resourcing and low recognition of library value from the wider institution.

text: Research support in New Zealand University Libraries Researcher-facing librarians in New Zealand are providing guidance across more of the research lifecycle than ever before in response to an increasingly complex scholarly ecosystem. This research explored the development of research support through survey responses from all eight New Zealand University Libraries. From the responses it was possible to ascertain the level of services offered or planned in the four key areas of research impact, Research Data Management, scholarly communication and Kaupapa Māori research. Skills gaps and barriers to service development were also identified. Comparison with an earlier study revealed that research impact and Research Data Management services have developed well over the last 6 years. A good level of maturity was identified in scholarly communication services but support for Kaupapa Māori research was identified as an area for development. Barriers to service development included lack of resourcing and low recognition of library value from the wider institution.

year: 2019-01-01