Effects of aging on the microstructure of a Cu-Al-Ni-Mn shape memory alloy
Yükleniyor...
Tarih
2011
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The influence of aging on the microstructure and mechanical properties of Cu-11.6wt%Al-3.9wt%Ni-2.5wt%Mn shape memory alloy (SMA) was studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometer, and differential scanning calorimeter (DSC). Experimental results show that bainite, gamma(2), and alpha phase precipitates occur with the aging effect in the alloy. After aging at 300dgC, the bainitic precipitates appear at the early stages of aging, while the precipitates of gamma(2) phase are observed for a longer aging time. When the aging temperature increases, the bainite gradually evolves into gamma(2) phase and equilibrium alpha phase (bcc) precipitates from the remaining parent phase. Thus, the bainite, gamma(2), and alpha phases appear, while the martensite phase disappears progressively in the alloy. The bainitic precipitates decrease the reverse transformation temperature while the gamma(2) phase precipitates increase these temperatures with a decrease of solute content in the retained parent phase. On the other hand, these precipitations cause an increasing in hardness of the alloy.
Açıklama
Anahtar Kelimeler
copper alloys, shape memory effect, martensitic transformations, aging, precipitates
Kaynak
International Journal Of Minerals Metallurgy And Materials
WoS Q DeÄŸeri
Q2
Scopus Q DeÄŸeri
Q1
Cilt
18
Sayı
4
Künye
closedAccess
