TY - JOUR
T1 - Phase decomposition in isothermally aged MA Cu-Ni-Fe and Cu-Ni-Cr alloys
AU - Hernandez-Santiago, F.
AU - Espinoza-Ramirez, I.
AU - Lopez-Hirata, V. M.
AU - Saucedo-Muñoz, M. L.
AU - Diaz-Barriga-Arceo, L.
AU - Dorantes-Rosales, H. J.
PY - 2007
Y1 - 2007
N2 - Supersaturated solid solutions of Cu-44.5at.%Ni-22.5at.%Fe and Cu-37at.%Ni-6at.%Cr alloy were produced by ball milling of a pure chemical elemental mixture for 1080 ks. Two fee supersaturated solid solutions with a grain size of about 20 and 50 nm, respectively, were obtained after milling. These alloys were subsequently aged at temperatures between 800 and 1003 K for different times. The aging promoted the phase decomposition of the supersaturated solid solution into a mixture of Cu-rich and Ni- phases in both the aged MA alloy powders. The growth kinetics of the modulation wavelength was determined from the X-ray diffraction results and followed the Lifshitz-Slyozov-Wagner theory for a diffusion-controlled coarsening in the mechanically-alloyed Cu-Ni-Fe alloy after aging. However, the sidebands intensity seems to be very low and overlapped with the peaks corresponding to the Cu-rich phase in the aged mechanically-alloyed Cu-Ni-Cr alloy. The growth kinetics of composition modulation wavelength for the aged MA Cu-Ni-Fe alloy was faster at 803 and 898 K than that for the same alloy composition obtained by a conventional processing and then aged at the same temperatures.
AB - Supersaturated solid solutions of Cu-44.5at.%Ni-22.5at.%Fe and Cu-37at.%Ni-6at.%Cr alloy were produced by ball milling of a pure chemical elemental mixture for 1080 ks. Two fee supersaturated solid solutions with a grain size of about 20 and 50 nm, respectively, were obtained after milling. These alloys were subsequently aged at temperatures between 800 and 1003 K for different times. The aging promoted the phase decomposition of the supersaturated solid solution into a mixture of Cu-rich and Ni- phases in both the aged MA alloy powders. The growth kinetics of the modulation wavelength was determined from the X-ray diffraction results and followed the Lifshitz-Slyozov-Wagner theory for a diffusion-controlled coarsening in the mechanically-alloyed Cu-Ni-Fe alloy after aging. However, the sidebands intensity seems to be very low and overlapped with the peaks corresponding to the Cu-rich phase in the aged mechanically-alloyed Cu-Ni-Cr alloy. The growth kinetics of composition modulation wavelength for the aged MA Cu-Ni-Fe alloy was faster at 803 and 898 K than that for the same alloy composition obtained by a conventional processing and then aged at the same temperatures.
KW - Cu-Ni-Fe and Cu-Ni-Cr alloys
KW - Mechanical alloying
KW - Spinodal decomposition
UR - http://www.scopus.com/inward/record.url?scp=57649103608&partnerID=8YFLogxK
M3 - Artículo de la conferencia
AN - SCOPUS:57649103608
SN - 1022-6680
VL - 15-17
SP - 678
EP - 683
JO - Advanced Materials Research
JF - Advanced Materials Research
T2 - 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC 2006
Y2 - 4 July 2006 through 8 July 2006
ER -