Microstructure characteristics of rapidly solidified alloys

✍ Scribed by R. Trivedi

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 599 KB
• Volume: 178
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(94)90531-2

✦ Synopsis

The microstructural characteristics of rapidly solidified materials were examined in terms of the effect of high velocity on the physical processes that govern microstructure formation. Under rapid solidification conditions, non-equilibrium conditions at the interface and a modified diffusional instability condition play critical roles in the selection of morphology and its microstructural scales. These effects were examined in terms of their influence on the physical processes. Appropriate characteristic lengths of physical processes for rapid solidification were developed, and relationships obtained for low and high growth rate conditions which characterize microstructural transition conditions and microstructural scales of cellular, dendritic and eutectic structures under free and constrained growth conditions. It is shown that all the results at low and high growth rates can be represented by unified expression in terms of redefined characteristic lengths.