Termomechaniczne aspekty przemiany fazowej w stopie TiNi z pamięcią kształtu indukowanej naprężeniem

• Autorzy: Pieczyska E.

Warianty tytułu

EN

Thermomechanical aspects of stress-induced martensite transformation in TiNi shape memory alloy

• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono wyniki badań sprzężeń termodynamicznych zachodzących podczas indukowanej naprężeniami przemiany fazowej w stopach TiNi z pamięcią kształtu. Wykazano, że przemiana martenzytyczna wprost i odwrotna, zachodząca podczas pseudosprężystego odkształcania tych stopów, ma charakter niejednorodny. Makroskopowo rozwija się w zlokalizowanych cienkich pasmach, podobnych do pasm Lüdersa, w dwóch prawie prostopadłych kierunkach, co udokumentowano stosując metodę badań w podczerwieni oraz fotografując relief na powierzchni próbki.

EN

Experimental investigations of thermomechanical couplings related to stress-induced martensite transformation in shape memory alloy (SMA) are presented in the paper. TiNi shape memory alloy specimens were subjected to uniaxial tensile tests carried out with various strain rates on an MTS testing machine (Fig. 1). The tem-perature changes, accompanying the process of stress-induced martensite transformation were recorded with use of a thermovision camera. It was shown that the martensite forward and reverse transformation, related to the SMA pseudo-elastic behavior, can occur and develop in inhomogeneous way in Lüders-like bands [3-5]. Nucleation and development of the phase transformation fronts in the SMA recorded by infrared camera were studied. Narrow bands of considerably higher temperature corresponding to the martensitic phase, starting from the central part of the specimen and developing towards the specimen grips, were recorded. Next, the upswing region was observed, manifested by the more advanced and more homogeneous stage of the phase transformation, accompanied by the more uniform temperature distribution. The inclined bands of heterogeneous temperature distribution were observed also during the unloading process of the SMA, while the reverse transformation accompanied by the temperature decrease took place [14]. The martensite transformation heterogeneity was confirmed by infrared technique and by photographs of the SMA specimen surface relief (Fig. 2). Thermomechanical aspects of the exothermic martensitic forward and the endothermic reverse transformations for various strain rates were analyzed.

Słowa kluczowe

PL

stop z pamięcią kształtu; TiNi; przemiana martenzytyczna; proces rozciągania; kamera termowizyjna; pomiar temperatury

EN

shape memory alloy; TiNi; martensite transformation; tension; infrared camera; temperature change

• Wydawca: Wydawnictwo PAK
• Czasopismo: Pomiary Automatyka Kontrola
• Rocznik: 2009
• Tom: R. 55, nr 11
• Strony: 958--961
• Opis fizyczny: Bibliogr. 4 poz., rys., tab., wzory

Twórcy

autor

Pieczyska E.

• Instytut Podstawowych Problemów Techniki PAN,

Bibliografia

• [1] K. Otsuka, C. Wayman Eds., Shape Memory Materials, Cambridge University Press, 1999, ISBN 0-521-663849.
• [2] B. Raniecki, Ch. Lexcellent and K. Tanaka, Thermodynamic models of pseudoelastic behaviour of shape memory alloys, Arch. Mech., 44, 3, 261-284, 1992.
• [3] J. A. Shaw and S. Kyriakides, On the nucleation and propagation of phase transformation fronts in a TiNi Alloy, Acta Mater. 45, 2, 683-700, 1997.
• [4] Z. Q. Li and Q. P. Sun, The initiation and growth of macroscopic martensite band in nano-grained NiTi microtube under tension, Int. Journal of Plasticity, 18 1481-1498, 2002.
• [5] P. Sinner, M. Landa, P. Lukas, V. Novak. R-phase transformation phenomena in thermomechanically loaded NiTi polycrystals, Mech. Mater. 38, 475-492, 2006.
• [6] Elżbieta Pieczyska Własności poznawcze i aplikacyjne stopów z pamięcią kształtu na przykładzie TiNi; NIT Nauka, Innowacje, Technika, 24-30, 4-5, 11, 2005.
• [7] Elzbieta A. Pieczyska, Stefan P. Gadaj, Wojciech K. Nowacki and Hisaaki Tobushi, Superelastic deformation behaviors based on phase transformation bands in TiNi shape memory alloy, Materials Transactions, 47, 3, 670-676, 2006.
• [8] E. A. Pieczyska, S. P. Gadaj, W. K. Nowacki and H. Tobushi, Transformation induced stress relaxation during superelastic behavior of TiNi SMA, Int. J. of Appl. Electromagnetic & Mechanics, 23, 3-8, 2006.
• [9] E. A. Pieczyska, S. P. Gadaj, W. K. Nowacki, H. Tobushi, Phase-transformation fronts evolution for strain- and stress-controlled tension tests in TiNi SMA, Exp.1 Mechanics, 46, 4, 531-542, 2006.
• [10] E. A. Pieczyska, W. K. Nowacki, T. Sakuragi and H. Tobushi, Superelastic deformation properties of TiNi shape memory alloy, Key Engineering materials, 340-341, 1211-1216, 2007.
• [11] Elzbieta A. Pieczyska, Hisaaki Tobushi, Wojciech K. Nowacki, Stefan P. Gadaj and Toshimi Sakuragi, Subloop Deformation Behavior of TiNi Shape Memory Alloy Subjected to Stress-Controlled Loadings, Materials Transactions, 48, No 10, 2679-2686, 2007.
• [12] H. Tobushi, E. A. Pieczyska, Y. Ejiri and T. Sakuragi, Thermomechanical Properties of SMA and Polymer and their Composite, Mechanics of Advance Mater. and Structures, 16, 236-247, 2009.
• [13] H. Tobushi, E. A. Pieczyska, W. K. Nowacki and Y. Sugimoto, SMA Thin Strip for Rotary-Driving Element, Solid State Phenomena, 154, 47-52, 2009.
• [14] Elżbieta Pieczyska, Analiza doświadczalna termomechanicznych właściwości stopu TiNi oraz poliuretanu z pamiecia ksztaltu, Prace IPPT, IFTR REPORTS, 2008, ISBN 978-83-89687-37-1, 214 stron, http://prace.ippt.gov.pWIFTR_Reports_3_2008.pdf.