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Resonant ultrasound spectroscopy of ternary Cu-Al-Ni shape memory alloy compacts fabricated via SPS technology
Pavlík, Marek ; Spotz, Zdeněk (referee) ; Čížek, Jan (advisor)
This thesis deals with applicability of powder metalurgy for production of Cu-Al-Ni shape memory alloys. It is part of series of studies, inherently expanding experimental work with samples previously produced through optimized mechanical alloying and compaction via SPS method. In this work, the samples were thermally annealed and characterized by two advanced methods, DTA and RUS. Significant changes occur within the material at temperatures of 240 °C and 300 °C. The measurements indicated a presence of a martensitic transformation that could correspond to the desired SME phenomenon. Apparently, the changes were not triggered throughout the entire sample volume and further experimental progress is therefore expected in the near future.
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Monitoring techniques for special alloys from some medical prostheses.
Savin, A. ; Vizureanu, P. ; Převorovský, Zdeněk ; Steigmann, R. ; Chlada, Milan ; Krofta, Josef ; Baltatu, M.S. ; Craus, M. L. ; Nový, F.
The paper presents complementary methods for noninvasive evaluation of an exotic class of alloys possible to be used in medical prosthetics. The interest in this study is the analysis of Ti alloys with different concentration of Mo and Si, in order to make the elastic modulus and Poisson ratio reach values appropriate with human bones. The both methods, acoustic emission and resonant ultrasound spectroscopy are proposed as complementary methods for nondestructive evaluation of entire sample volume.
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Resonant ultrasound spectroscopy of ternary Cu-Al-Ni shape memory alloy compacts fabricated via SPS technology
Pavlík, Marek ; Spotz, Zdeněk (referee) ; Čížek, Jan (advisor)
This thesis deals with applicability of powder metalurgy for production of Cu-Al-Ni shape memory alloys. It is part of series of studies, inherently expanding experimental work with samples previously produced through optimized mechanical alloying and compaction via SPS method. In this work, the samples were thermally annealed and characterized by two advanced methods, DTA and RUS. Significant changes occur within the material at temperatures of 240 °C and 300 °C. The measurements indicated a presence of a martensitic transformation that could correspond to the desired SME phenomenon. Apparently, the changes were not triggered throughout the entire sample volume and further experimental progress is therefore expected in the near future.
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