MyJournals Home  

RSS FeedsMaterials, Vol. 12, Pages 245: Size-Dependent Phase Transformation during Gas Atomization Process of Cu-Sn Alloy Powders (Materials)

 
 

18 january 2019 03:00:09

 
Materials, Vol. 12, Pages 245: Size-Dependent Phase Transformation during Gas Atomization Process of Cu-Sn Alloy Powders (Materials)
 


For binary element atomization, it is essential to investigate the phase transformation from liquid to solid as a functions of the droplet sizes, as well as the reaction competitiveness, during gas atomizing solidification of their nuclei. In the present work, a series of phase transformations of undercooled Cu (60.9 wt.%)/Sn droplets were analyzed when atomized by pressure gas. The results indicated that the microstructures of the obtained powders and their morphologies were highly relevant to the droplet size. According to the phase characteristics analyzed by the microstructural observations in combination with the transient nucleation theory, powders with sizes from 10 to 100 μm were divided into three categories, exhibiting lotus-leaf, island, and stripe morphologies. The competitive formation of Cu6Sn5 or Cu3Sn was also controlled by the droplet sizes, and a diameter of approximately 45 μm was identified as the threshold size. After heat treatment at 300 °C for 4 h, the powders consisted of a single η’ Cu6Sn5 phase. The obtained Cu6Sn5 phase powders can be used in the field of high-temperature applications as intermetallic balls for integrated chip interconnects.


 
46 viewsCategory: Chemistry, Physics
 
Materials, Vol. 12, Pages 247: Strengthening from Cu Addition in 0.2C-(1-2)Mn Steels during Tempering (Materials)
Materials, Vol. 12, Pages 244: Effect of Moisture on Shape Memory Polyurethane Polymers for Extrusion-Based Additive Manufacturing (Materials)
 
 
blog comments powered by Disqus


MyJournals.org
The latest issues of all your favorite science journals on one page

Username:
Password:

Register | Retrieve

Search:

Physics


Copyright © 2008 - 2024 Indigonet Services B.V.. Contact: Tim Hulsen. Read here our privacy notice.
Other websites of Indigonet Services B.V.: Nieuws Vacatures News Tweets Nachrichten