摘要
本文采用真空热压烧结方法制备了碳化硼(B_4C)颗粒增强AZ91镁基复合材料(B_4C/AZ91),研究了不同的烧结温度对B_4C/AZ91镁基复合材料微观组织及性能的影响。研究结果表明:复合材料内部主要物相为Mg和B_4C,B_4C颗粒在基体镁合金当中均匀分布,颗粒与基体之间界面结合良好,在颗粒与基体的界面处存在厚度为3μm的界面反应层。当烧结温度为490℃,复合材料的硬度和压缩强度达到极大值,分别为HV132.8和407 MPa,该复合材料的断裂方式为脆性剪切断裂。B_4C颗粒加入到镁合金基体中具有强化作用,其强化机理主要为热配错强化、载荷传递强化和Orowan强化机理。
The B4C particle reinforced AZ91 Mg-matrix composites （B4C/AZ91） with absorbing neutrons was fabricated by vacuum hot-pressed sintered （VHPS） technology-. Tile influence of different temperatures on microstructure and mechanical properties of B4C/AZ91 composites was studied. The results show that the composites mainly exist B4C phase and Mg phase. Meanwhile,B4C particle evenly distributed in AZ91 Mg-matrix and the interface of rein/breed phases and matrix was combined well. The thickness of reactive layer is around 3 bun. When the sintered temperature reached 490 ~（2, the maxinmnl value of hardness and compression strength of the composite is HV132.8 and 407 MPa,respeetively. At the same time,the fl＇aeture mechanism was brittle shear ti＇aeture. B4C particles play a strengthening role in the composites ,the main mechanism of reinfbreement is themml mismatch strengthening, load transfer strengthening and Orowam strengthening.
作者
赵兴国
聂慧慧
陈洪胜
张媛琦
ZHAO Xing-guo1,3 ,NIE Hui-hui2,3, CHEN Hongs-heng2,3 ,ZHANG Yuan-qi1,(1. College ofMechcalical cald Vehicle Engineering, Taiyucal University of Technology, Taiyuan Shanxi 030024, China; 2. Shanxi Key Laboratory of A dvanced Magrwsium-based Materials, Taiyuan Shanxi 030024, China; 3. College of Materials Science and Engineering, Taiyucal University of Technology, Taiyuan Shanxi 030024, China)
出处
《铸造设备与工艺》
2018年第5期57-62,共6页
Foundry Equipment & Technology
基金
国家自然科学基金资助项目(51474152)
联合基金重点支持项目(U1710254)
关键词
真空热压
中子吸收
B4C/AZ91
界面
强化机理
vacumn hot-pressed sintered technology
absorbing neutrons
B4C/AZ91
interface
reinforcement nmchanism
