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The high-strain dynamic behavior of NiTi shape memory alloy has significant applications in several fields such as military af- fairs, aerospace. In order to investigate the transformation behavior in NiTi alloy, induced by dynamic mechanics, the shock-loading experiments are performed using a single stage gas gun at different temperatures and different shock velocities. Differential scanning calorimeter (DSC) and comprehensive physical property measurement system are employed to analyze the phase transformation in- duced by residual effects of shock waves in NiTi alloy. Three endotherms are observed in the first heating cycle, showing the presence of three-step reverse phase transformation; whereas during the second heating only one endotherm is seen, because the other two en- dotherms attributed to stress-induced martensite have disappeared. The exothermic and endothermic peak, owing to the transformation of shock-treated specimens, become small and their transformation temperature regions are broadened. This tendency indicates that the internal defects in the specimens, introduced by shock-treated, increase the resistance of phase transformation. The exothermic peaks of specimens, shock-treated at low velocity and high velocity, all shift to the low-temperature-zone, because the dislocations increase the hindrance to martensitic transformation. However, the endothermic peaks of specimens with low velocity shock-treated shift to high-temperature-zone, illustrating that the reverse martensitic transformation is also opposed by dislocations; while the endothermic peaks shift to low-temperature-zone for high velocity shock-treated, due to the decrease of transformation energy, caused by the re-duction of recoverable martensite. A small shoulder is detected in exothermic peak, whose shape becomes sharper with shock rate increasing. This result reveals that the intermediate phase (R-phase) results in two-stage phase transformation. The electrical resistivity measurement result further confirms that the two types of phase transformations associated with austenite to rhombohedral (A→R) and rhombohedral to martensite (R→M) can occur at the same time in a certain temperature range.
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Keywords:
- NiTi shape memory alloy /
- dynamic shock /
- DSC /
- phase transformation
[1] Elahinia M H, Hashemi M, Tabesh M, Bhaduri S B 2012 Prog. Mater. Sci. 57 911
[2] Es-Souni M, Es-Souni M, Fischer-Brandies H 2005 Anal. Bioanal. Chem. 381 557
[3] Li Q, Zeng Y J, Tang X Y 2010 Australas. Phys. Eng. Sci. Med. 33 129
[4] Carroll M C, Somsen Ch, Eggeler G 2004 Scripta Mater. 50 187
[5] Millett J C F, Bourne N K, GrayIII G T 2002 J. Appl. Phys. 92 3107
[6] Matsumoto H, Kondo K, Dohi S, Sawaoka A 1987 J. Mater. Sci. 22 581
[7] Xu X, Thadhani N 2001 Scripta Mater. 44 2477
[8] Xu X, Thadhani N 2004 Mater. Sci. Eng. A 384 194
[9] Li T C, Qui Y B, Liu J T, Wang F T, Zhu M, Yang D Z 1992 J. Mater. Sci. Lett. 11 845
[10] Han X, Zou W, Way R, Jin S, Zhang Z, Li T, Yang D 1997 J. Mater. Sci. Lett. 32 4723
[11] Millett J C F, Bourne N K 2004 Mater. Sci. Eng. A 378 138
[12] Meziere Y J E, Millett J C F 2006 J. Appl. Phys. 100 033513
[13] Thakur A M, Thadhani N N, Schwarz R B 1997 Metall. Mater. Trans. A 28 1445
[14] Escobar J C, Clifton R J, Yang S Y 2000 Shock Compression of Condensed Matter-1999 Woodbury, NY, American 1999 p267
[15] Matsumoto H, Kondo K, Sawaoka A 1989 J. Jpn. Inst. Met. 53 134
[16] Kuruta T, Matsumoto H, Abe H 2004 J. Alloys Compd. 381 158
[17] Kuruta T, Matsumoto H, Sakamoto K, Abe H 2005 J. Alloys Compd. 400 92
[18] Su P C, Wu S K 2004 Acta Mater. 52 1117
[19] He X M, Rong L J 2004 Scripta Mater. 51 7
[20] Liu H C, Wu S K, Chou T S 1991 Acta Metall. Mater. 39 2069
[21] Uchil J, Mahesh K K, Ganesh Kumara K 2002 Physica B 324 419
[22] Huang C M, Meichle M, Salamon M B, Wayman C M 1983 Phil. Mag. A 47 9
[23] Olbricht J, Yawny A, Pelegrina J L, Dlouhy A, Eggeler G 2011 Metall. Mater. Trans. A 42A 2556
[24] Otsuka K, Ren X 2005 Prog. Mater. Sci. 50 511
[25] Yong M L, Wagner M F X, Frenzel J, Schmahl W W, Eggeler G 2010 Acta Mater. 58 2344
[26] Khelfaoui F, Guénin G 2003 Mater. Sci. Eng. A 355 292
[27] Michutta J, Carroll M C, Yawny A, Somsen Ch, Neuking K, Eggeler G 2004 Mater. Sci. Eng. A 378 152
[28] Chang S H, Wu S K, Chang G H 2005 Scripta Mater. 52 1341
[29] Shang S, Hokamoto K, Meyers M A 1992 J Mater. Sci. 27 5470
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[1] Elahinia M H, Hashemi M, Tabesh M, Bhaduri S B 2012 Prog. Mater. Sci. 57 911
[2] Es-Souni M, Es-Souni M, Fischer-Brandies H 2005 Anal. Bioanal. Chem. 381 557
[3] Li Q, Zeng Y J, Tang X Y 2010 Australas. Phys. Eng. Sci. Med. 33 129
[4] Carroll M C, Somsen Ch, Eggeler G 2004 Scripta Mater. 50 187
[5] Millett J C F, Bourne N K, GrayIII G T 2002 J. Appl. Phys. 92 3107
[6] Matsumoto H, Kondo K, Dohi S, Sawaoka A 1987 J. Mater. Sci. 22 581
[7] Xu X, Thadhani N 2001 Scripta Mater. 44 2477
[8] Xu X, Thadhani N 2004 Mater. Sci. Eng. A 384 194
[9] Li T C, Qui Y B, Liu J T, Wang F T, Zhu M, Yang D Z 1992 J. Mater. Sci. Lett. 11 845
[10] Han X, Zou W, Way R, Jin S, Zhang Z, Li T, Yang D 1997 J. Mater. Sci. Lett. 32 4723
[11] Millett J C F, Bourne N K 2004 Mater. Sci. Eng. A 378 138
[12] Meziere Y J E, Millett J C F 2006 J. Appl. Phys. 100 033513
[13] Thakur A M, Thadhani N N, Schwarz R B 1997 Metall. Mater. Trans. A 28 1445
[14] Escobar J C, Clifton R J, Yang S Y 2000 Shock Compression of Condensed Matter-1999 Woodbury, NY, American 1999 p267
[15] Matsumoto H, Kondo K, Sawaoka A 1989 J. Jpn. Inst. Met. 53 134
[16] Kuruta T, Matsumoto H, Abe H 2004 J. Alloys Compd. 381 158
[17] Kuruta T, Matsumoto H, Sakamoto K, Abe H 2005 J. Alloys Compd. 400 92
[18] Su P C, Wu S K 2004 Acta Mater. 52 1117
[19] He X M, Rong L J 2004 Scripta Mater. 51 7
[20] Liu H C, Wu S K, Chou T S 1991 Acta Metall. Mater. 39 2069
[21] Uchil J, Mahesh K K, Ganesh Kumara K 2002 Physica B 324 419
[22] Huang C M, Meichle M, Salamon M B, Wayman C M 1983 Phil. Mag. A 47 9
[23] Olbricht J, Yawny A, Pelegrina J L, Dlouhy A, Eggeler G 2011 Metall. Mater. Trans. A 42A 2556
[24] Otsuka K, Ren X 2005 Prog. Mater. Sci. 50 511
[25] Yong M L, Wagner M F X, Frenzel J, Schmahl W W, Eggeler G 2010 Acta Mater. 58 2344
[26] Khelfaoui F, Guénin G 2003 Mater. Sci. Eng. A 355 292
[27] Michutta J, Carroll M C, Yawny A, Somsen Ch, Neuking K, Eggeler G 2004 Mater. Sci. Eng. A 378 152
[28] Chang S H, Wu S K, Chang G H 2005 Scripta Mater. 52 1341
[29] Shang S, Hokamoto K, Meyers M A 1992 J Mater. Sci. 27 5470
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