特种铸造及有色合金
特種鑄造及有色閤金
특충주조급유색합금
SPECIAL CASTING & NONFERROUS ALLOYS
2010年
3期
206-209
,共4页
原位内生%铝基复合材料%制备工艺%凝固动态曲线%拉伸性能
原位內生%鋁基複閤材料%製備工藝%凝固動態麯線%拉伸性能
원위내생%려기복합재료%제비공예%응고동태곡선%랍신성능
In-situ Synthesis%Aluminum Matrix Composites%Fabrication Process%Solidified Dynamic Curves%Tensile Behavior
利用原位法制备了TiB_2/Al复合材料.根据X-射线衍射图探讨了增强相形成机制,测定了材料凝固动态曲线并分析了影响凝固的3个主要因素,采用扫描电镜研究了材料的拉伸性能.结果表明,当B_2O_3与TiO_2的摩尔比为1.0时,反应式为:3TiO_2+10Al+3B_2O_3→5Al_2O_3+3TiB_2.影响材料凝固的3个主要因素是颗粒在母相中的分布,B_2O_3与TiO_2的摩尔比以及反应温度.材料的强化主要是TiB_2颗粒的弥散强化(即奥罗万机制)和TiB_2为形核核心作用所导致的晶粒细化,材料的断裂属于TiB_2颗粒被拔出而形成的微孔聚集型韧性断裂.
利用原位法製備瞭TiB_2/Al複閤材料.根據X-射線衍射圖探討瞭增彊相形成機製,測定瞭材料凝固動態麯線併分析瞭影響凝固的3箇主要因素,採用掃描電鏡研究瞭材料的拉伸性能.結果錶明,噹B_2O_3與TiO_2的摩爾比為1.0時,反應式為:3TiO_2+10Al+3B_2O_3→5Al_2O_3+3TiB_2.影響材料凝固的3箇主要因素是顆粒在母相中的分佈,B_2O_3與TiO_2的摩爾比以及反應溫度.材料的彊化主要是TiB_2顆粒的瀰散彊化(即奧囉萬機製)和TiB_2為形覈覈心作用所導緻的晶粒細化,材料的斷裂屬于TiB_2顆粒被拔齣而形成的微孔聚集型韌性斷裂.
이용원위법제비료TiB_2/Al복합재료.근거X-사선연사도탐토료증강상형성궤제,측정료재료응고동태곡선병분석료영향응고적3개주요인소,채용소묘전경연구료재료적랍신성능.결과표명,당B_2O_3여TiO_2적마이비위1.0시,반응식위:3TiO_2+10Al+3B_2O_3→5Al_2O_3+3TiB_2.영향재료응고적3개주요인소시과립재모상중적분포,B_2O_3여TiO_2적마이비이급반응온도.재료적강화주요시TiB_2과립적미산강화(즉오라만궤제)화TiB_2위형핵핵심작용소도치적정립세화,재료적단렬속우TiB_2과립피발출이형성적미공취집형인성단렬.
TiB_2 particle reinforced aluminum matrix composites were synthesized by in-situ reaction, and the formation mechanism of reinforcement in the composites was analyzed by XRD (X-ray diffraction), and three key factors influencing solidification process were analyzed by measuring solidified dynamic curves of the composites, meanwhile, tensile behavior of the composites was observed by the SEM (scanning electron microscope). The chemical reactive formula is described as 3TiO_2 +10Al+3B_2O_3→5Al_2O_3 +3TiB_2 with molar ratio of 1 of TiO_2 via B_2O_3. The solidification process is mainly controlled by distribution of particles in the matrix, molar ratio of TiO_2 via B_2O_3 and reactive temperature. The strengthening mechanism is characterized by dispersed enhancing from TiB_2 particle and fine-grain enhancing resulting form TiB_2 as nuclei substrate. Fracture mechanism of the composites is characterized by micro-hole concentrating toughening failure from TiB_2 particle pulled out.
