Effect of Microstructure on Martensitic Transformation and Cyclic Deformation Characteristics in a Cu-Al-Ni Based Alloy with Unidirectionally Solidified Structure

Gon Seung Yang; K.H. Kim; Kabilan M; Kwang Koo Jee; Woo Yang Jang

doi:10.4028/www.scientific.net/SSP.118.491

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HomeSolid State PhenomenaSolid State Phenomena Vol. 118Effect of Microstructure on Martensitic...

Effect of Microstructure on Martensitic Transformation and Cyclic Deformation Characteristics in a Cu-Al-Ni Based Alloy with Unidirectionally Solidified Structure

Abstract:

The effect of the betatizing conditions on microstructure, transformation characteristics and pseudoelastic behavior has been studied in an unidirectionally solidified Cu-Al-Ni based alloy. The coarse γ2 phase is precipitated in the cast-rod betatized at 650 and the volume fraction of it is decreased by increasing the betatizing temperature above 700 . However, a small amount of γ2 phase is left behind despite betatizing at 800 . No martensitic transformation takes place in the cast-rod betatized at 650, because the precipitation of γ2 phase leads to stabilization of β1 parent phase. However, β1→β1′ martensitic transformation occurs in the cast-rod betatized at 700 and both β1→β1′ and β1→γ1′ martensitic transformations concurrently undergoes in the cast-rod betatized above 750 because of the slope of Al concentration nearby γ2 phase. The loaddisplacement loop of the as-cast rod betatized at 750 is linear, but those of the as-cast rods betatized at 800 and 850 are non-linear showing the typical pseudoelastic loop and the deformation is completely recovered upon unloading.

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Periodical:

Solid State Phenomena (Volume 118)

Pages:

491-496

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.118.491

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Online since:

December 2006

Authors:

Gon Seung Yang, K.H. Kim, Kabilan M, Kwang Koo Jee, Woo Yang Jang

Keywords:

Cu-Al-Ni Based Alloy, Cyclic Deformation, Martensitic Transformation (MT), Microstructural Change, Pseudoelasticity, γ2' Phase

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