title: Metal Injection Moulding of High Nb-Containing TiAl Alloy and Its Oxidation Behaviour at 900°C

authors: Liu, Chengcheng

subjects: high Nb-containing TiAl alloy

abstract: High Nb-containing TiAl alloy with a nominal composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at %) was fabricated by metal injection moulding (MIM) technology with an improved wax-based binder. The critical powder loading and feedstock rheological behaviour were determined. The influence of sintering temperature on microstructures and mechanical properties of the sintered samples and their oxidation behaviour were also investigated. Results showed that a feedstock, with a powder loading of 68 vol % and good flowability, could be obtained by using the improved binder, and oxygen pick-up was lower than that of the sample prepared by using a traditional binder. The ultimate tensile strength (UTS) and plastic elongation of the sample sintered at 1480 °C for 2 h were 412 MPa and 0.33%, at room temperature, respectively. The 1480 °C-sintered sample consisted of γ/α2 lamellar microstructure with the average colony size of about 70 µm, and its porosity was about 4%. The sintered alloy showed better oxidation resistance than that of the cast alloy counterpart.

text: Metal Injection Moulding of High Nb-Containing TiAl Alloy and Its Oxidation Behaviour at 900°C High Nb-containing TiAl alloy with a nominal composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at %) was fabricated by metal injection moulding (MIM) technology with an improved wax-based binder. The critical powder loading and feedstock rheological behaviour were determined. The influence of sintering temperature on microstructures and mechanical properties of the sintered samples and their oxidation behaviour were also investigated. Results showed that a feedstock, with a powder loading of 68 vol % and good flowability, could be obtained by using the improved binder, and oxygen pick-up was lower than that of the sample prepared by using a traditional binder. The ultimate tensile strength (UTS) and plastic elongation of the sample sintered at 1480 °C for 2 h were 412 MPa and 0.33%, at room temperature, respectively. The 1480 °C-sintered sample consisted of γ/α2 lamellar microstructure with the average colony size of about 70 µm, and its porosity was about 4%. The sintered alloy showed better oxidation resistance than that of the cast alloy counterpart.

year: 2018

title: Everyone, no-one, someone and the Native Hawaiian learner: How expanded equality narratives might account for guarantee/reality gaps, historico-legal context and an admission policy which is actually levelling the playing field

authors: Hemi, Keakaokawai Varner

subjects: Indigenous education rights

abstract: This thesis asks how a school which was established to help a group of children consistently identified with disparities in education achieve equality—and which has actually done so—could be sued for discrimination because it prefers those children in admissions. In search of answers, this thesis critically analyzes the narratives of equality evident in the United States Ninth Circuit Court of Appeal’s reasoning in Doe v Kamehameha Schools, arguing that the dissent, majority and concurrence opinions suggest three conflicting narratives of equality—what the thesis calls the adamant everyone/no-one, weak someone and limited indigenous learner narratives.  It demonstrates how these narratives reflect an identity-specific, racialized history of slavery and segregation but fail to account entirely for either the unique historico-legal history of the Native Hawaiian people or the huge gap between formal constitutional guarantees of equality and everyday realities of complex discrimination and disparities almost unrelentingly attracted to Native Hawaiian identity.  It recommends an expansion of these narratives within federal law consistent with liberal theory, international law and the legal experience of a sister settler jurisdiction—Aotearoa New Zealand.  More importantly, it demonstrates that such expansion is consistent with substantial equality, non-discrimination and rights of self-determination that may have the greatest capacity for reconciling the guarantee/reality gap.  Finally, specific good, better and best recommendations are made including philosophical consistency with the expanded multi-narrative, and the intentional importation of the human right to education and Article 14 of the UN Declaration on the Rights of Indigenous Peoples 2007 into federal law.

text: Everyone, no-one, someone and the Native Hawaiian learner: How expanded equality narratives might account for guarantee/reality gaps, historico-legal context and an admission policy which is actually levelling the playing field This thesis asks how a school which was established to help a group of children consistently identified with disparities in education achieve equality—and which has actually done so—could be sued for discrimination because it prefers those children in admissions. In search of answers, this thesis critically analyzes the narratives of equality evident in the United States Ninth Circuit Court of Appeal’s reasoning in Doe v Kamehameha Schools, arguing that the dissent, majority and concurrence opinions suggest three conflicting narratives of equality—what the thesis calls the adamant everyone/no-one, weak someone and limited indigenous learner narratives.  It demonstrates how these narratives reflect an identity-specific, racialized history of slavery and segregation but fail to account entirely for either the unique historico-legal history of the Native Hawaiian people or the huge gap between formal constitutional guarantees of equality and everyday realities of complex discrimination and disparities almost unrelentingly attracted to Native Hawaiian identity.  It recommends an expansion of these narratives within federal law consistent with liberal theory, international law and the legal experience of a sister settler jurisdiction—Aotearoa New Zealand.  More importantly, it demonstrates that such expansion is consistent with substantial equality, non-discrimination and rights of self-determination that may have the greatest capacity for reconciling the guarantee/reality gap.  Finally, specific good, better and best recommendations are made including philosophical consistency with the expanded multi-narrative, and the intentional importation of the human right to education and Article 14 of the UN Declaration on the Rights of Indigenous Peoples 2007 into federal law.

year: 2016

title: Māori women’s perspectives of leadership and wellbeing

authors: Ruru, Stacey Mariu

subjects: Māori leadership

abstract: Within Aotearoa, New Zealand, Māori women are engaged in leadership roles in community and professional workplace settings, however little is known about how they maintain their wellbeing. This research sought to unravel how Māori women leaders maintain their wellbeing, while occupied in complex leadership roles. We report on the findings from semi-structured interviews, acknowledging kaupapa Māori theory and principles, with five Māori women leaders. Thematic analysis was used, and these themes related to five whakataukī (proverb) that provided overarching themes and directions relating to Māori women’s leadership and wellbeing. Each whakataukī describe unique aspects of leadership and wellbeing from a Māori worldview. Themes include humility, collectiveness, courage, future orientations and positivity. While the themes are housed in whakataukī, central to the success of these Māori women leaders was being connected to whānau (family) and friends, and being influenced by tamariki (children), tauira (students) and employees. These social connections made Māori women leaders strong and resilient to change and challenges.

text: Māori women’s perspectives of leadership and wellbeing Within Aotearoa, New Zealand, Māori women are engaged in leadership roles in community and professional workplace settings, however little is known about how they maintain their wellbeing. This research sought to unravel how Māori women leaders maintain their wellbeing, while occupied in complex leadership roles. We report on the findings from semi-structured interviews, acknowledging kaupapa Māori theory and principles, with five Māori women leaders. Thematic analysis was used, and these themes related to five whakataukī (proverb) that provided overarching themes and directions relating to Māori women’s leadership and wellbeing. Each whakataukī describe unique aspects of leadership and wellbeing from a Māori worldview. Themes include humility, collectiveness, courage, future orientations and positivity. While the themes are housed in whakataukī, central to the success of these Māori women leaders was being connected to whānau (family) and friends, and being influenced by tamariki (children), tauira (students) and employees. These social connections made Māori women leaders strong and resilient to change and challenges.

year: 2017