Abstract
In order to clarify the potential of developing Mg-Zn-Al-RE-Ca-based heat resistant magnesium alloy, the influences of different La and Ca combinations on the microstructure and mechanical properties of Mg-4Zn-4Al-xLa-yCa (x + y = 4) alloys have been investigated. The results show that the high content of La and Ca additions promotes Al2LaZn2, Al4Ca and Ca2Mg6Zn3 isomorphous phases forming in the as-cast Mg-Zn-Al-La-Ca alloys, instead of the formation of low melting point Mg-Al and Mg-Zn-Al eutectics. Among all the secondary phases, the Al2LaZn2 phase is prior to form by consuming up La atoms, and then the Al reacts with Ca to form Al4Ca, and finally the surplus Zn reacts with Ca and Mg to form Ca2Mg6Zn3 phase. The Ca2Mg6Zn3 isomorphous phase contains a certain amount of Al, and its volume fraction is increased with increasing Ca content. The tensile strengths at both room temperature and 175 °C are increased with increasing Ca addition, while the ductility is decreased due to the increased formation of networked Ca2Mg6Zn3 phase. The Mg-4Zn-4Al-2La-2Ca alloy shows the optimal tensile properties at both room temperature and high temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
