中北大学学报（自然科学版）2026，Vol.47Issue(2)：156-163,8.DOI:10.62756/jnuc.issn.1673-3193.2025.11.0017
石墨烯含量对半固态注射成型制备镁基复合材料组织性能的影响
Effect of Graphene Content on the Microstructure and Properties of Magnesium Matrix Composites Fabricated by Semi-Solid Injection Molding
摘要
Abstract
Magnesium matrix composites with different graphene nanoplatelet(GNPs)contents were fabricated based on thixomolding technology,and the effects of GNPs content on the microstructure,interfacial structure,and mechanical properties of the composites were systematically investigated.Using AZ91D magnesium alloy as the matrix,composites with GNPs mass fraction of 0.3%,0.6%,and 0.9%were prepared.The grain morphology was observed by optical microscopy,the dispersion state and failure mode of GNPs were char-acterized by scanning electron microscopy,and the interfacial structure between GNPs and the matrix was analyzed by transmission electron microscopy.The results show that an appropriate amount of GNPs sig-nificantly refines the grains.When the GNPs mass fraction increased from 0.3%to 0.6%,the average grain size decreased from 5.5 μm to 3.5 μm.However,when the GNPs mass fraction further increased from 0.6%to 0.9%,the average grain size increased from 3.5 μm to 4.2 μm.In the composite with 0.6%GNPs,the GNPs were uniformly distributed as thin flakes at both grain boundaries and within the grains,and TEM analysis revealed good interfacial bonding with the magnesium matrix.The failure modes of GNPs during fracture were classified into debonding and fracture.During the thixomolding process,the screw shear effectively achieved uniform dispersion of GNPs and prevented agglomeration;meanwhile,the uniformly dispersed GNPs significantly enhanced the mechanical properties of the composite,increasing the ultimate tensile strength by 21.7%.This study reveals the dispersion behavior and interfacial bonding characteristics of GNPs in magnesium matrix composites,providing an experimental basis for the design and fabrication of high-performance magnesium matrix composites.关键词
半固态注射成型/镁基复合材料/界面结构/石墨烯纳米片Key words
semi-solid injection molding/magnesium matrix composites/interface structure/graphene nanoplatelet分类
矿业与冶金引用本文复制引用
陈利文,曹甲祺,景舰辉,赵源,高琪淮,王舒婷,赵宇宏..石墨烯含量对半固态注射成型制备镁基复合材料组织性能的影响[J].中北大学学报（自然科学版）,2026,47(2):156-163,8.基金项目
国家自然科学基金资助项目(U25A20286,52275390,52375394,U23A20628) （U25A20286,52275390,52375394,U23A20628）
国家外国专家项目(S20250277) （S20250277）
山西省外国专家项目(202504051012025) （202504051012025）
山西省科技重大专项计划"揭榜挂帅"项目(202301050201004) （202301050201004）
