TY - JOUR
T1 - Phase decomposition in an Fe-40 at.% Cr alloy after isothermal aging and its effect on hardening
AU - Lopez-Hirata, Victor M.
AU - Soriano-Vargas, Orlando
AU - Rosales-Dorantes, Hector J.
AU - Muñoz, Maribel L.Saucedo
N1 - Funding Information:
The authors wish to acknowledge the financial support from SIP-IPN-CONACYT 100584 .
PY - 2011/8
Y1 - 2011/8
N2 - The phase decomposition process of an Fe-40 at.% Cr alloy was studied after isothermal aging at 475 and 500 °C using a high-resolution transmission electron microscope, as well as hardness measurements. High-resolution transmission electron microscope observations showed that the hardening behavior is associated with the formation of the nanometric coherent decomposed Cr-rich and Fe-rich phases with irregular shape and interconnected as expected for a spinodally-decomposed alloy. As the aging progressed, coherent rounded Cr-rich phase precipitates were observed in the Fe-rich phase matrix. The coarsening process of the Cr-rich phase was observed for aging times up to 750 h. Nevertheless, no decrease in hardness with time was observed because of the nanometric size of the Cr-rich phase, less than 10 nm. Aging hardening was higher at 500 °C because of the higher decomposition kinetics.
AB - The phase decomposition process of an Fe-40 at.% Cr alloy was studied after isothermal aging at 475 and 500 °C using a high-resolution transmission electron microscope, as well as hardness measurements. High-resolution transmission electron microscope observations showed that the hardening behavior is associated with the formation of the nanometric coherent decomposed Cr-rich and Fe-rich phases with irregular shape and interconnected as expected for a spinodally-decomposed alloy. As the aging progressed, coherent rounded Cr-rich phase precipitates were observed in the Fe-rich phase matrix. The coarsening process of the Cr-rich phase was observed for aging times up to 750 h. Nevertheless, no decrease in hardness with time was observed because of the nanometric size of the Cr-rich phase, less than 10 nm. Aging hardening was higher at 500 °C because of the higher decomposition kinetics.
KW - Fe-Cr alloys
KW - Hardening behavior
KW - Phase decomposition
UR - http://www.scopus.com/inward/record.url?scp=79958292492&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2011.05.012
DO - 10.1016/j.matchar.2011.05.012
M3 - Artículo
SN - 1044-5803
VL - 62
SP - 789
EP - 792
JO - Materials Characterization
JF - Materials Characterization
IS - 8
ER -