Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 773, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138725
Keywords
Magnesium alloys; High-pressure die casting (HPDC); Transmission electron microscopy (TEM); Intermetallic phase; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [11804030, 51701200, 21601017]
- Project for Science & Technology Development of Jilin Province [20180520160JH, 20180520004JH, 20180520166JH]
- Project of Jilin Provincial Department of Education [JJKH201905831U]
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Effects of 2 wt% Gd addition on microstructures and tensile properties of a high-pressure die casting (HPDC) Mg-4Al-3La-0.3Mn (wt.%) alloy were studied. The newly developed alloy owns much finer grains than commercial/experimental HPDC Mg alloys. Furthermore, it contains various intermetallic phases, namely eta-Al-3(La, Gd), Al-2(Gd,La) or Al-2(La,Gd), Al-7(La,Gd)(3) and Al-2.12(La,Gd)(0.88), among which Al-7(La,Gd)(2) was experimentally observed in Mg-Al-RE-based alloys for the first time. Moreover, both eta-Al-3(La,Gd) and Al-2(Gd,La) present two or more morphologies due to different chemical compositions. Finally, the studied alloy exhibits more excellent tensile properties than commercial/experimental HPDC Mg-Al-based alloys. The underlying causes for grain refinement, variety of intermetallic phases, as well as excellent tensile properties were discussed and revealed.
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