摘要
利用熔体原位反应法制备了（Al2O3＋Al3Zr）p／A356复合材料．研究了添加质量分数均为0．2％的Mn和Cr微合金元素对所制备的复合材料微观组织和室温力学性能的影响．SEM分析结果表明：添加微合金元素改善了（Al2O3＋Al3Zr）p／A356复合材料的微观组织，原位Al3Zr颗粒和初生α相得到了有效细化，尺寸大部分为2-3αm，增强颗粒均匀分布在A356基体中，颗粒呈球形或椭球形．室温拉伸试验结果表明，添加微合金元素对复合材料的力学性能有一定程度的改善，其抗拉强度σ，屈服强度σs。和延伸率δ较添加前分别提高了13．9％，16．9％和10．6％，达到326．1MPa，252．2MPa和5．2％．SEM拉伸断口形貌分析表明，其断裂属于塑性断裂．
The A356 matrix composites reinforced by Al2O3 and Al3Zr particulates were fabricated by the direct melt reaction. Effects of adding 0.2% Mn and 0. 2% Cr on the microstructure and mechanical properties of （Al2O3 ＋ Al3Zr）p/A356 composites were investigated. The SEM analysis results indicate that the added alloying elements can amend the microstructure of （Al2O3 ＋ Al3Zr）p/A356 composites and in-situ Al3Zr particulates and the α-Al are refined effectively. Reinforcement particulates are distributed uniformly in the A356 matrix with sizes about 2 ～3 μm. The mechanical properties test results show that adding 0.2% Mn and 0.2% Cr can amend the mechanical properties of the composites to a certain degree. The values of the tensile strength σb, yield strength σs and elongation δ reach to 326. 1 MPa, 252.2 MPa and 5.2% respectively, with increments of 13.9% without adding Mn and Cr. The fracture morphology indicates A356 composites is plastic fracture. 16.9% and 10.6% that the fracture of （ compared to those Al2O3 ＋ Al3 Zr ） p/A356 composites is plastic fracture.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2007年第4期312-315,共4页
Journal of Jiangsu University：Natural Science Edition
基金
江苏省科技成果转化项目(BA2005054)
江苏省高技术研究项目(BG2005026)
江苏省铝基复合材料工程技术中心研发项目(BM2003014)
