Dendrite coherency during equiaxed solidification in binary aluminum alloys |
| |
Authors: | Guocai Chai Ph.D. Lennart BÄckerud Tone RØlland Lars Arnberg |
| |
Affiliation: | (1) Department of Structural Chemistry, Arrhenius Laboratory, Stockholm University, S-10691 Stockholm, Sweden;(2) Department of Metallurgy, Norwegian Institute of Technology, N-7034 Trondheim, Norway |
| |
Abstract: | Dendrite coherency, or dendrite impingement, is important to the formation of the solidification structure and castability of alloys. Dendrite coherency in the systems Al-xMn, Al-xCu, Al-xFe, and Al-xSi(x = 0 to 5 wt pct) has been studied by continuous torque measurement in solidifying samples. The fraction solid at the dendrite coherency point, fs*, varies with the alloy system and the solute concentration in the alloy, from 18 to 56 pct for the present alloys investigated. An increase in solute concentration decreases the coherency fraction solid,fs*. An alloy system with a large slope of the liquidus line has a high coherency fraction solid. A theoretical approach has been developed to account for the effects of the alloy system and solute concentration on the dendrite coherency in the alloy. The grain sizes of the alloys were evaluated using the parameters at coherency point. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|