Kinetics of isothermal decomposition in polycrystalline β CuAlBe alloys

Montecinos, S.; Cuniberti, A.; Castro, M. L.

doi:10.1016/j.intermet.2009.06.004

Cited by 12 publications

(11 citation statements)

References 19 publications

(27 reference statements)

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“…The CuAlBe alloys suffer one order transformation under heating, DO 3 ? A2 at around 800 K for the studied composition [27]. Then, the grain growth proceeds in the disordered state (A2 phase) during the heat treatments.…”

Section: Resultsmentioning

confidence: 98%

Grain size evolution in Cu-based shape memory alloys

et al. 2015

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A study of the grain growth kinetics in two shape memory alloys, CuAlBe and CuZnAl, is reported. Isothermal aging treatments at temperatures between 1023 and 1123 K were conducted, determining the grain size distribution as a function of time. The results show that the size distribution can be described by a log-normal type relationship, and is time-invariant. It was found that the arithmetic mean grain size almost coincide with the mode, which means that it is a representative parameter of the microstructure along the annealing time. The growth kinetics is strongly dependent on the aging temperature in CuZnAl, while is weakly in CuAlBe. It was verified that the grain size-time power law usually applied is not appropriate to describe the process, and an early departure from the ideal behavior is observed. The modification with a time-dependent dragging force gives a reasonable approximation to the grain growth kinetic. The obtained results are compared with the scarce data existing on this type of alloys.

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Section: Resultsmentioning

confidence: 98%

Grain size evolution in Cu-based shape memory alloys

et al. 2015

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“…For that, a CueAleBe alloy with a DO 3 / 18R transformation is used. This system has relative advantages when subjected to thermal treatments: i) the grain growth can be well controlled [12], ii) the b phase is highly stable, and then precipitation can be avoided [13], iii) no chemical composition changes are detected under the required thermal treatments. This last point is extremely important considering that M s increases 114 K each 1 at.% Be decrease [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of grain size on the stress–temperature relationship in a β CuAlBe shape memory alloy

2011

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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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Kinetics of isothermal decomposition in polycrystalline β CuAlBe alloys

Cited by 12 publications

References 19 publications

Grain size evolution in Cu-based shape memory alloys

Grain size evolution in Cu-based shape memory alloys

Effect of grain size on the stress–temperature relationship in a β CuAlBe shape memory alloy

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

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