title: Filtered cathodic vacuum arc deposition of thin film copper

authors: Lau, S. P.

subjects: Filtered cathodic vacuum arc

abstract: A major obstacle for metallization application of filtered cathodic vacuum arc (FCVA) is the presence of micro-particles. By using an off-plane double bend magnetic filter, metallic films can be deposited with relevant deposition rates and free of micro-particles. Clean copper thin films with low electrical resistivity were deposited by filtered cathodic vacuum arc techniques at room temperature. All the copper films have a polycrystalline structure and preferably oriented to (111). When the substrate bias is applied, the (111) orientation of Cu film is further enhanced. The internal stress of the films is strongly dependent on the substrate bias. When the bias increases from 0 to −600 V, the internal stress of the film changes from tensile to compressive. At the bias of −300 V, a stress-free Cu film can be obtained.

text: Filtered cathodic vacuum arc deposition of thin film copper A major obstacle for metallization application of filtered cathodic vacuum arc (FCVA) is the presence of micro-particles. By using an off-plane double bend magnetic filter, metallic films can be deposited with relevant deposition rates and free of micro-particles. Clean copper thin films with low electrical resistivity were deposited by filtered cathodic vacuum arc techniques at room temperature. All the copper films have a polycrystalline structure and preferably oriented to (111). When the substrate bias is applied, the (111) orientation of Cu film is further enhanced. The internal stress of the films is strongly dependent on the substrate bias. When the bias increases from 0 to −600 V, the internal stress of the film changes from tensile to compressive. At the bias of −300 V, a stress-free Cu film can be obtained.

year: 2001-11

title: Evaluation of the mechanical properties of powder metallurgy Ti-6Al-7Nb alloy

authors: Bolzoni, Leandro

subjects: Titanium alloy

abstract: Titanium and its alloys are common biomedical materials owing to their combination of mechanical properties, corrosion resistance and biocompatibility. Powder metallurgy (PM) techniques can be used to fabricate biomaterials with tailored properties because changing the processing parameters, such as the sintering temperature, products with different level of porosity and mechanical performances can be obtained. This study addresses the production of the biomedical Ti-6Al-7Nb alloy by means of the master alloy addition variant of the PM blending elemental approach. The sintering parameters investigated guarantee that the complete diffusion of the alloying elements and the homogenization of the microstructure is achieved. The sintering of the Ti-6Al-7Nb alloy induces a total shrinkage between 7.4% and 10.7% and the level of porosity decreases from 6.2% to 4.7% with the increment of the sintering temperature. Vickers hardness (280–300 HV30) and tensile properties (different combination of strength and elongation around 900 MPa and 3%) are achieved.

text: Evaluation of the mechanical properties of powder metallurgy Ti-6Al-7Nb alloy Titanium and its alloys are common biomedical materials owing to their combination of mechanical properties, corrosion resistance and biocompatibility. Powder metallurgy (PM) techniques can be used to fabricate biomaterials with tailored properties because changing the processing parameters, such as the sintering temperature, products with different level of porosity and mechanical performances can be obtained. This study addresses the production of the biomedical Ti-6Al-7Nb alloy by means of the master alloy addition variant of the PM blending elemental approach. The sintering parameters investigated guarantee that the complete diffusion of the alloying elements and the homogenization of the microstructure is achieved. The sintering of the Ti-6Al-7Nb alloy induces a total shrinkage between 7.4% and 10.7% and the level of porosity decreases from 6.2% to 4.7% with the increment of the sintering temperature. Vickers hardness (280–300 HV30) and tensile properties (different combination of strength and elongation around 900 MPa and 3%) are achieved.

year: 2017-03

title: Ungentlemanly warfare: The impact of irregular warfare on military strategy in the New Zealand Wars

authors: Foy, Rhys

subjects: New Zealand Wars

abstract: ‘Ungentlemanly Warfare’ examines the impact of irregular warfare on strategic thinking in the New Zealand Wars (1845–1872). Britain entered the period as an eighteenth-century force reliant on European methods of war. In contrast, Māori were an experienced bushfighting force depleted on manpower but experiencing a period of military innovation. This interaction led to an important exchange of strategic ideology and methods.  
This thesis tracks how Māori, British, and colonial forces developed and exchanged irregular warfare practices across three regions and time periods. The Northern War exposed the shortcomings of conventional military conduct. Māori leadership altered their strategic approach and pursued a strategy of elastic offence. In contrast, British leadership persisted with their ineffective conventional means of warfare. In the Waikato War, British strategy was influenced by the success of colonial irregulars. British strategic and operational methods changed with the inclusion of multi-echelon warfare and the indirect approach. Kīngitanga leadership improved their combat capacity through guerrilla warfare, decentralised command, and a grand strategy of elastic offence. The Taranaki and West Coast campaigns highlighted the relationship between the use of irregular warfare and military success in New Zealand. Both sides experienced success and failure across numerous conflicts, the defining factor being the active use of irregular warfare. These case studies reveal the significance of irregular warfare strategies and tactics to military success in colonial New Zealand. They also reveal opportunities and challenges to military adaptation in Māori, British, and colonial martial cultures of the nineteenth century. 
 ‘Ungentlemanly Warfare’ provides a unique approach to the examination of the New Zealand Wars conflict. It is an operational history that draws upon methods and aspects of the ‘war and society’ approach to military history, especially the use of Māori scholarship, evidence, and theory. The thesis’ chapters consider strategic and tactical decision-making across the numerous conflicts within the period. To do so, I provide close readings of primary evidence, including military communication and reports, early histories, and first-person accounts, to identify the roles of irregular warfare and strategic adaptions in the New Zealand Wars. 
	‘Ungentlemanly Warfare’ analyses the impact of irregular warfare on the strategic thinking of military leaders within the New Zealand Wars. I argue that irregular warfare strategies and tactics played a significantly larger role in the outcome of events than previously acknowledged. This study illustrates the importance of guerrilla warfare and the strategy of elastic offence to Māori strategy. In contrast, it highlights the evolution of British military thinking from conventional conservatism to a multi-echelon force led by irregular warfare units and tactics. ‘Ungentlemanly Warfare’ argues that irregular warfare was central to military conflicts in nineteenth-century New Zealand.

text: Ungentlemanly warfare: The impact of irregular warfare on military strategy in the New Zealand Wars ‘Ungentlemanly Warfare’ examines the impact of irregular warfare on strategic thinking in the New Zealand Wars (1845–1872). Britain entered the period as an eighteenth-century force reliant on European methods of war. In contrast, Māori were an experienced bushfighting force depleted on manpower but experiencing a period of military innovation. This interaction led to an important exchange of strategic ideology and methods.  
This thesis tracks how Māori, British, and colonial forces developed and exchanged irregular warfare practices across three regions and time periods. The Northern War exposed the shortcomings of conventional military conduct. Māori leadership altered their strategic approach and pursued a strategy of elastic offence. In contrast, British leadership persisted with their ineffective conventional means of warfare. In the Waikato War, British strategy was influenced by the success of colonial irregulars. British strategic and operational methods changed with the inclusion of multi-echelon warfare and the indirect approach. Kīngitanga leadership improved their combat capacity through guerrilla warfare, decentralised command, and a grand strategy of elastic offence. The Taranaki and West Coast campaigns highlighted the relationship between the use of irregular warfare and military success in New Zealand. Both sides experienced success and failure across numerous conflicts, the defining factor being the active use of irregular warfare. These case studies reveal the significance of irregular warfare strategies and tactics to military success in colonial New Zealand. They also reveal opportunities and challenges to military adaptation in Māori, British, and colonial martial cultures of the nineteenth century. 
 ‘Ungentlemanly Warfare’ provides a unique approach to the examination of the New Zealand Wars conflict. It is an operational history that draws upon methods and aspects of the ‘war and society’ approach to military history, especially the use of Māori scholarship, evidence, and theory. The thesis’ chapters consider strategic and tactical decision-making across the numerous conflicts within the period. To do so, I provide close readings of primary evidence, including military communication and reports, early histories, and first-person accounts, to identify the roles of irregular warfare and strategic adaptions in the New Zealand Wars. 
	‘Ungentlemanly Warfare’ analyses the impact of irregular warfare on the strategic thinking of military leaders within the New Zealand Wars. I argue that irregular warfare strategies and tactics played a significantly larger role in the outcome of events than previously acknowledged. This study illustrates the importance of guerrilla warfare and the strategy of elastic offence to Māori strategy. In contrast, it highlights the evolution of British military thinking from conventional conservatism to a multi-echelon force led by irregular warfare units and tactics. ‘Ungentlemanly Warfare’ argues that irregular warfare was central to military conflicts in nineteenth-century New Zealand.

year: 2023