Evolution of macroscopic elastic moduli of martensitic polycrystalline NiTi and NiTiCu shape memory alloys with pseudoplastic straining

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• 作者：Martina Thomasová ; ^a ; Hanu&scaron ; Seiner^b ; ^{hseiner@it.cas.cz" class="auth_mail" title="E-mail the corresponding author} ; Petr Sedlá ; k^b ; Miroslav Frost^b ; Martin &Scaron ; evčí ; k^b ; Ivo Szurman^c ; Radim Kocich^c ; Jan Drahokoupil^d ; Petr &Scaron ; ittner^d ; Michal Landa^b
• 关键词：Shape memory alloys ; Polycrystals ; Elastic behavior ; Martensitic phase transformation ; Resonant ultrasound spectroscopy
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：123
• 期：Complete
• 页码：146-156
• 全文大小：917 K

文摘

Elastic constants of polycrystalline NiTi and NiTiCu shape memory alloys in the martensite phase were determined by resonant ultrasound spectroscopy; the evolution of these constants was studied with subsequent applications of compressive loads inducing reorientation of martensitic variants. While the initial thermally-induced martensite exhibited only weak elastic anisotropy resulting from the underlying crystallographic texture of the parent phase, the materials with oriented martensitic microstructures exhibited strong elastic anisotropy with Young's moduli in different directions differing by several tens of GPa−s. A qualitative difference in behaviors was observed between the monoclinic B19′ martensite in the NiTi alloy and the orthorhombic B19 martensite in the NiTiCu alloy.