期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 818, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152925
关键词
Mg matrix composites; Powder thixoforming; Microstructure; Mechanical properties; Strengthening mechanisms
资金
- Natural Science Foundation of Ningxia University [ZR1702]
AZ91D Mg-based composites containing carbon nanotubes (CNTs), magnesium silicide (Mg2Sip) nanoparticles, or CNTs-Mg2Sip hybrid reinforcements were synthesized via powder thixoforming using blending and pressing procedures in powder metallurgy, followed by partial remelting and thixoforming technology. The thixoformed microstructure of the CNTs-Mg2Sip hybrid reinforced Mg composite consisted of spheroidal primary alpha-Mg particles, intergranular secondary solidified structures (SSSs), and hybrid reinforcements homogeneously dispersed within the SSSs. A yield strength of 180 MPa was achieved in the Mg matrix composite reinforced by 0.75CNTs-0.75Mg(2)Si(p) hybrids, which was 26% and 12% higher than those of composites reinforced with individual 1.5CNTs and 1.5Mg(2)Si(p), respectively (143 and 161 MPa, respectively). This was attributed to the in situ-synthesized Mg2Sip around the CNTs, which not only restricted the aggregation and pulling out of CNTs but also facilitated the synergistic strengthening effect of the CNTs. This work presents a promising strategy for the synthesis of metal matrix composites with impressive mechanical properties by employing hybrids of CNTs and Mg2Sip as reinforcements. (C) 2019 Elsevier B.V. All rights reserved.
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