Effect of cooling rate on the phase transformation behavior and mechanical properties of Ni-rich NiTi shape memory alloy

Motemani, Yahya; Nili‐Ahmadabadi, Mahmoud; Tan, Ming Jen; Bornapour, Mosayeb; Rayagan, Sh.

doi:10.1016/j.jallcom.2008.01.153

Cited by 79 publications

(30 citation statements)

References 16 publications

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“…The result is inconsistent with the results published by Motemani et al [45]. They reported only around 1% strain until fracture for the solution treated Ti-50.7 at.% Ni NiTi alloy at 1000ºC for 5h followed by water and ice-bath quenching.…”

Section: Resultscontrasting

confidence: 95%

Adjustment of Aging Temperature for Reaching Superelasticity in Highly Ni-Rich Ti-51.5Ni NiTi Shape Memory Alloy

Karimzadeh

Aboutalebi

Salehi

et al. 2015

Materials and Manufacturing Processes

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In this research, the effects of aging temperature on the phase transformation, mechanical properties, and superelasticity of Ti-51.5 at.% Ni alloy were investigated. For this purpose, samples were solution annealed and then aged at different temperatures ranging from 300 to 700ºC. The results showed that the change of aging temperature has a great influence on the behavior of the alloy. Aging at 300 and 400ºC led to the occurrence of the austenite to R phase (A↔R) transformation. By aging at these temperatures, the ultimate tensile strength and elongation did not change significantly compared to the solution annealed sample. Aging at 500 and 600ºC lead to the appearance of B19´ phase during cooling cycle of differential scanning calorimetry tests. Samples aged at 500ºC and 600ºC showed the best mechanical properties, in comparison to the other aging temperatures. Maximum tensile strength of 1250 MPa and the elongation of 25% were obtained by aging at 500 and 600ºC, respectively. Solution annealed sample showed no superelastic property. Complete superelasticity was observed by aging at 400 and 500ºC.The sample aged at 700ºC showed the transformation behavior and mechanical properties similar to the solution annealed sample.

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Section: Resultscontrasting

confidence: 95%

Adjustment of Aging Temperature for Reaching Superelasticity in Highly Ni-Rich Ti-51.5Ni NiTi Shape Memory Alloy

Karimzadeh

Aboutalebi

Salehi

et al. 2015

Materials and Manufacturing Processes

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“…Furthermore, Nagarajan and Chattopadhyay [4] characterized the detailed microstructures of rapid-solidified near equiatomic TiNi alloys containing small amount of Si, and described the trend of the refinement of the microstructure. More recently, Yamamoto et al [5] studied the martensitic transformation and microstructure of Ti-rich Ti-Ni as-atomized powders, and Motemani et al [6] found that Ni 3 Ti intermetallic compounds have a great influence on martensitic phase transformation temperature of Ni-rich NiTi alloy, and further, Nama et al [7] revealed the shape memory characteristics and relationship between microstructure and mechanical properties of Ti-45Ni-5Cu alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution in laser solid forming of Ti–50wt% Ni alloy

Lin

Yang

et al. 2009

Journal of Alloys and Compounds

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“…Ni-rich NiTi alloys may endure rhombohedral phase (R) transformation at the intermediate temperatures (B2→R→B19′) [41]. All start and finish phase transformation *Corresponding author: nader_elbagoury@yahoo.com KIM and Springer temperatures depend on the chemical composition, Ni content, heat treatment and thermomechanical processes [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Influence of aging on microstructure, martensitic transformation and mechanical properties of NiTiRe shape memory alloy

2014

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Aging is an effective way to adapt the microstructure, phase transformation and consequently the mechanical properties of NiTi shape memory alloys. In the present study, Ni52Ti47.7Re0.3 shape memory alloy was solution treated at 1000°C for 24 h then aged at various temperatures of 300, 400, 500 and 600°C for 3 h. The influence of aging treatment on microstructure, martensitic transformation and mechanical properties of Ni52-Ti47.7Re0.3 was investigated. The microstructure of the solution treated alloy was martensite as a matrix phase and precipitates of Ti2Ni phase. The aged alloys had a microstructure as same as that of solution treated alloy in addition to the existence of other types of precipitates like Ni4Ti3 and Ni3Ti. The martensitic -austenitic transformation during heating and cooling was going through one stage of transformation. The martensitic phase transformation temperature increased by the increase of aging temperature but still lower than that of solution treated alloy.

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Effect of cooling rate on the phase transformation behavior and mechanical properties of Ni-rich NiTi shape memory alloy

Cited by 79 publications

References 16 publications

Adjustment of Aging Temperature for Reaching Superelasticity in Highly Ni-Rich Ti-51.5Ni NiTi Shape Memory Alloy

Adjustment of Aging Temperature for Reaching Superelasticity in Highly Ni-Rich Ti-51.5Ni NiTi Shape Memory Alloy

Microstructure evolution in laser solid forming of Ti–50wt% Ni alloy

Influence of aging on microstructure, martensitic transformation and mechanical properties of NiTiRe shape memory alloy

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