摘要
为了研究多重结构对铝基复合材料力学性能的影响,将气雾化态Al2024合金粉末与球磨不同时间的Ti-10%(质量分数,下同)B_4C复合粉末混合,采用热压烧结和热挤压的方法制备多重结构Ti-B_4C/Al2024复合材料。通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和拉伸试验机对不同材料的显微组织与力学性能进行观察和测试,并对多重结构复合材料的强韧化行为进行讨论。结果表明:Ti-B_4C/Al2024复合材料多重结构包括基体Al2024、核壳结构Ti/Al_(18)Ti_2Mg_3组织和B_4C颗粒。向Al2024中加入5%预先球磨6h后的Ti-B_4C粉末时,其屈服强度从107MPa提高到122MPa,并且表现出与热挤压Al2024合金几乎相同的伸长率。当球磨时间延长至12h时,试样5TB-12h的伸长率可达到16.4%。然而,复合材料的伸长率随着Ti-B_4C添加量的增加而降低。
In order to study the effect of hybrid structure on the mechanical properties of aluminum matrix composites.The gas-atomized Al2024 powders were mechanically blended with Ti-10%(mass fraction)B4C powders by ball milling for different time,and then compacting the powders via hot press sintering and hot extrusion to fabricate the hybrid structured Ti-B4C/Al2024 composite.The microstructure and mechanical properties of different materials were observed and tested by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and tensile testing machine.The strengthening and toughening behavior of hybrid structured composites were further discussed.The results show that the hybrid structured Ti-B4C/Al2024 composite consists of Al2024 matrix,core-shell structured Ti/Al18Ti2Mg3 and B4C particles.With the addition of 5%Ti-B4C hybrid powder after ball milling for 6h,the yield strength increases from 107MPa to 122MPa,and the composite exhibits almost the same elongation as that of the hot extruded Al2024 alloy.When the milling time is extended to 12h,the elongation of the sample 5TB-12h can reach 16.4%.However,the elongation of the composites decreases with the increase of Ti-B4C.
作者
李惠
肖文龙
张艺镡
马朝利
LI Hui;XIAO Wen-long;ZHANG Yi-tan;MA Chao-li(Key Laboratory of Aerospace Materials and Performance ofMinistry of Education,School of Materials Science andEngineering,Beihang University,Beijing 100191,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第4期152-159,共8页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(51671007)
国际科技合作项目(2015DFA51430)
航空科学基金(2015ZF51)
关键词
金属基复合材料
铝合金
多重结构
力学性能
metal matrix composites
aluminum alloy
hybrid structure
mechanical property
