Effect of γ2-phase precipitates on the martensitic transformation of a β-CuAlBe shape memory alloy

Cuniberti, A.; Montecinos, S.; Lovey, F.C.

doi:10.1016/j.intermet.2008.12.001

Cited by 30 publications

(16 citation statements)

References 23 publications

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“…aging at 550°C will precipitate martensiteand γ2 phase, increase aging time led to increase amount of precipitate of γ 2 . Figures 7-16 shows martensite phase at different magnifications [5][6][7][8][9][10]. …”

Section: Sme=θm/180mentioning

confidence: 99%

Effect of Heat Treatment of Cu-Al-Be Shape Memory Alloy on Microstructure, Shape Memory Effect and Hardness

Al-Haidary¹,

Mustafa²,

Hamza³

2017

J Material Sci Eng

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Cu-13Al-0.545Be shape memory alloy are heat treatment at different temperature and time. The microstructure of alloy after heat treatment at 850°C, 650°C and aging at 150°C ,450°C and 550°C for 2, 4 and 6 h study by optical microscope and X-ray diffraction. Bending test is use to show effect of heat treatment on super-elastic and shape memory effect.Micro hardness test used to show effect of heat treatment on micro hardness .shape memory effect increase at heat treatment 650°C and aging at 150°C, while at 450°C and 550°C will decrease because precipitate formation rate rises with increase in temperature and time. The hardness and precipitates in the alloy increases with increasing ageing duration. Higher ageing temperature avoids the imperfection by moving and filling the empty space thereby hardens the alloy.

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Section: Sme=θm/180mentioning

confidence: 99%

Effect of Heat Treatment of Cu-Al-Be Shape Memory Alloy on Microstructure, Shape Memory Effect and Hardness

Al-Haidary¹,

Mustafa²,

Hamza³

2017

J Material Sci Eng

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“…On the other hand, α p particles act as strong obstacles for SIMT due to restricting the matrix/martensite mobility (22) . Therefore, the measured global trigger stress (trigger stress measured by tensile tests) should be decreased in the samples solution treated at relatively higher temperatures, in which less α p appears.…”

Section: Solution Treated Below 760℃mentioning

confidence: 99%

Effect of Solution Treatment Temperature on Trigger Stress for Stress Induced Martensitic Transformation in Ti-10V-2Fe-3Al Alloy

Chen

Song

Sun

et al. 2010

JMMP

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Effect of solution treatment temperature on trigger stress for stress induced martensitic transformation (SIMT) in Ti-10V-2Fe-3Al alloy has been investigated. The Ti-10V-2Fe-3Al tensile specimens were solution treated at 700-900℃ and quenched to room temperature in water. All specimens, except the one solution treated at 700℃, experienced the SIMT when subjected to tensile deformation. The trigger stress was observed to initially decrease with the solution temperature increasing from 720℃ to 760℃. However, it increased with the temperature increasing from 760℃ to 900℃. Optical microstructure shows that with increasing solution temperature from 700℃ to 740℃, β grain size of Ti-1023 alloy kept invariable. However, recrystallization was observed when solution treated at 760℃. The recrystallized β grains grew larger and larger with increasing solution treatment temperature from 760℃ to 900℃. In addition, the volume fraction of primary alpha phase (α p ) always decreased with increasing ST temperature from 700℃ to 780℃. The microstructure was composed of only β single phase when solution treated from 830℃ to 900℃. Energy dispersive spectrometry (EDS) analysis indicates that the molybdenum equivalency (Mo eq ) of β matrix steeply decreased initially as solution temperature increased from 700 ℃ to 760 ℃ . However, it almost kept invariable with solution treatment temperature increasing from 760℃ to 900℃. This evolution in trigger stress was attributed to the variations of volume fraction of primary α phase, chemical composition of β phase and the β grain size with different solution treatment temperatures.

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“…Most of the unique properties of this alloy such as shape memory effect (SME) and pseudoelasticity (PE) originate from its martensitic transformation which occurs with the shear mechanism between the high temperature B2 phase (austenite) and the low temperature B19' (martensite) phase [4]. According to the thermoelastic nature of the martensitic transformation in NiTi, many factors such as Ni/Ti ratio and internal / external stresses can affect this transformation, and, as a consequence, alter the final product properties [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Challenges of Using Elemental Nickel and Titanium Powders for the Fabrication of Monolithic NiTi Parts

Farvizi¹

2017

Archives of Metallurgy and Materials

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Due to its interesting properties and wide applications in different industries, fabrication of monolithic NiTi with cost-effective methods is an important and attractive issue. One of the economic ways to fabricate NiTi is employing elemental nickel and titanium powders. In this study, effects of using elemental powders as a precursor on the microstructure and mechanical properties of HIP-consolidated NiTi samples will be explored. The result of XRD analysis showed that after HIP process an interwoven structure which consists of NiTi 2 , Ni 3 Ti and B2-B19′ NiTi evolves. The formation of NiTi 2 /Ni 3 Ti intermetallics is thermodynamically favored which affects different aspects of this alloy: (i) it alters martensitic transformation temperatures; (ii) restricts essential properties of this alloy such as PE and SME, (iii) increases hardness, and (iv) yields to premature fracture at small strains during tensile tests.

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Effect of γ2-phase precipitates on the martensitic transformation of a β-CuAlBe shape memory alloy

Cited by 30 publications

References 23 publications

Effect of Heat Treatment of Cu-Al-Be Shape Memory Alloy on Microstructure, Shape Memory Effect and Hardness

Effect of Heat Treatment of Cu-Al-Be Shape Memory Alloy on Microstructure, Shape Memory Effect and Hardness

Effect of Solution Treatment Temperature on Trigger Stress for Stress Induced Martensitic Transformation in Ti-10V-2Fe-3Al Alloy

Challenges of Using Elemental Nickel and Titanium Powders for the Fabrication of Monolithic NiTi Parts

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