title: Thermomechanical processing of cost-affordable powder metallurgy Ti-5Fe alloys from the blended elemental approach: Microstructure, tensile deformation behavior, and failure

authors: Romero Villarreal, Carlos

subjects: Science & Technology

abstract: The development of cost-affordable Ti alloys is key for the application of Ti in other industries like the automobile sector. Therefore, a combination of powder metallurgy (PM) and low-cost compositions is an interesting approach. In this article, a cost-affordable PM Ti-5Fe alloy is processed following the blended elemental route and extruded at high temperature to remove porosity. Different extrusion temperatures and heat treatments (i.e., solution treatment and aging, STA) are performed to obtain ultrafine microstructures, and their effect on the mechanical behavior is studied. For extrusions in the β phase, microstructures consist of coarse lamellar colonies, resulting in alloys with improved properties compared to the as-sintered alloy but still lacking toughness due to the failure happening just after necking onset. Extruding in the α + β phase results in a bimodal microstructure of fine elongated primary α and coarse lamellar colonies, and the alloy becomes tougher. STA with aging below the eutectoid temperature of 590 °C leads to a hard but brittle alloy, whereas STA with aging above it results in alloys with strength comparable to the as-extruded conditions and enhanced ductility.

text: Thermomechanical processing of cost-affordable powder metallurgy Ti-5Fe alloys from the blended elemental approach: Microstructure, tensile deformation behavior, and failure The development of cost-affordable Ti alloys is key for the application of Ti in other industries like the automobile sector. Therefore, a combination of powder metallurgy (PM) and low-cost compositions is an interesting approach. In this article, a cost-affordable PM Ti-5Fe alloy is processed following the blended elemental route and extruded at high temperature to remove porosity. Different extrusion temperatures and heat treatments (i.e., solution treatment and aging, STA) are performed to obtain ultrafine microstructures, and their effect on the mechanical behavior is studied. For extrusions in the β phase, microstructures consist of coarse lamellar colonies, resulting in alloys with improved properties compared to the as-sintered alloy but still lacking toughness due to the failure happening just after necking onset. Extruding in the α + β phase results in a bimodal microstructure of fine elongated primary α and coarse lamellar colonies, and the alloy becomes tougher. STA with aging below the eutectoid temperature of 590 °C leads to a hard but brittle alloy, whereas STA with aging above it results in alloys with strength comparable to the as-extruded conditions and enhanced ductility.

year: 2020

title: Lesbian, gay, and bisexual (LGB) identities

authors: Semlyen, Joanna

abstract: Psychology has a long history of pathologizing LGB identities. Although decades of sociolegal change and advancement of LGBTIQ+ psychology have afforded LGB people the right to self-determination, much of psychology continues to ignore the ways in which the power of LGB people can only exist within the framework of heteronormativity. Even in the western world, the inclusion of LGB people is not universally experienced. The existence of continued victimization, and more subtle forms of discrimination including the appropriation of "gay" culture, indicates that the privileging of heterosexual identities and "lifestyles" is still very much present. Interfacing with constructs such as heteronormativity, liberal humanism, and homonormativity this chapter explores the way in which LGB identities are impacted by politics and power. It also explores the way in which the constituent groups under the LGB identities umbrella are differentially affected by gendered politics, and the ways in which some ways of being LGB are privileged over others under heteronormativity.

text: Lesbian, gay, and bisexual (LGB) identities Psychology has a long history of pathologizing LGB identities. Although decades of sociolegal change and advancement of LGBTIQ+ psychology have afforded LGB people the right to self-determination, much of psychology continues to ignore the ways in which the power of LGB people can only exist within the framework of heteronormativity. Even in the western world, the inclusion of LGB people is not universally experienced. The existence of continued victimization, and more subtle forms of discrimination including the appropriation of "gay" culture, indicates that the privileging of heterosexual identities and "lifestyles" is still very much present. Interfacing with constructs such as heteronormativity, liberal humanism, and homonormativity this chapter explores the way in which LGB identities are impacted by politics and power. It also explores the way in which the constituent groups under the LGB identities umbrella are differentially affected by gendered politics, and the ways in which some ways of being LGB are privileged over others under heteronormativity.

year: 2023-12-28

title: Homeless Māori Men: Re-connection, Re-joining, and Re-membering Ways of Being

authors: King, Pita Richard Wiremu

subjects: Māori psychology

abstract: There are a range of interventions and programmes to address the on-going issue of Māori homelessness. This thesis explores a gardening project hosted by a Ngāti Whātua marae (communal complex used for everyday Māori life) in Auckland for homeless Māori men. The garden project facilitates a sense of belonging, dignity, purpose, meaning and connectedness with other Māori people. It provides insights into how culturally-patterned relationships are centrally important to resolving the overrepresentation of indigenous peoples’ in homelessness populations. I employ the use of semi-structured interviews, reflective journaling, and photography as techniques to record and document the daily interactions in the marae gardens. Participants came from three distinct groups, which include: homeless Māori men, the Auckland City Mission, and Ngāti Whātua o Orakei. A total of eight participants were formally interviewed, along with another six who engaged in casual conversations, in this research, with ages ranged from 30 to 70 years of age. Key findings from this research relate to the construction and preservation of Māori identity while in a state of homelessness, the functioning of marae as spaces of care that foster the wellbeing of Māori, and the role of food in the reproduction of Māori cultural values in everyday life. The broader significance of my work is to use indigenous concepts to build an understanding of the activities, needs and relationships of homeless Māori men that they can recognise themselves from.

text: Homeless Māori Men: Re-connection, Re-joining, and Re-membering Ways of Being There are a range of interventions and programmes to address the on-going issue of Māori homelessness. This thesis explores a gardening project hosted by a Ngāti Whātua marae (communal complex used for everyday Māori life) in Auckland for homeless Māori men. The garden project facilitates a sense of belonging, dignity, purpose, meaning and connectedness with other Māori people. It provides insights into how culturally-patterned relationships are centrally important to resolving the overrepresentation of indigenous peoples’ in homelessness populations. I employ the use of semi-structured interviews, reflective journaling, and photography as techniques to record and document the daily interactions in the marae gardens. Participants came from three distinct groups, which include: homeless Māori men, the Auckland City Mission, and Ngāti Whātua o Orakei. A total of eight participants were formally interviewed, along with another six who engaged in casual conversations, in this research, with ages ranged from 30 to 70 years of age. Key findings from this research relate to the construction and preservation of Māori identity while in a state of homelessness, the functioning of marae as spaces of care that foster the wellbeing of Māori, and the role of food in the reproduction of Māori cultural values in everyday life. The broader significance of my work is to use indigenous concepts to build an understanding of the activities, needs and relationships of homeless Māori men that they can recognise themselves from.

year: 2014