Author/Editor		Shuai, Gewang; Zhang, Meng; Yan, Yongli
Title		The effect of rare earth elements on Cr precipitations in a Cu-0.8WT%Cr alloy
Type		članek
Source		Image Anal Stereol
Vol. and No.		Letnik 23, št. 2
Publication year		2004
Volume		str. 137-41
Language		eng
Abstract		The microstructural evolution of Cu-based alloys during aging was studied using a quantitative metallographic method. Samples were cut from ingots of Cu-0.8wt%Cr and Cu-0.8wt%Cr-RE alloys. These were solution treated at 1000 °C for 1.5 h and subsequently quenched in water, then separately aged at 480 °C for different durations. The microstructures were observed by optical microscope, and the characteristic geometric parameters of precipitated Cr phase, including volume fraction Vv, face density NA, mean diameter and roundness, were measured. These data provided more details about the process of aging. The results showed that precipitation of Cr phase occurred in the form of particles during aging. Rare earth elements promoted the precipitation of Cr phase and dispersed Cr particles. The phenomenon of overaging came earlier in Cu-Cr-RE than in Cu-Cr. In the present work, the optimal aging time at 480 °C was 2 hrs for the Cu-0.8wt%Cr-RE alloy and 3 hours for the Cu-0.8wt%Cr alloy.
Descriptors		CHROMIUM ALLOYS COPPER CHROMIUM PRECIPITATION PARTICLE SIZE X-RAY DIFFRACTION