采用微合金化和熔体原位合成法制备了(Al_2O_3+Al_3Zr)_p/A356复合材料,研究了微合金化对复合材料显微组织和力学性能的影响.结果表明:微合金化后复合材料中Al_2O_3和Al_3Zr的尺寸更加细小,在0.5～2μm之间,分布更加均匀,颗粒形貌趋于球形,周边圆滑;其力学性能较未添加合金元素的复合材料有明显提高;当添加0.2%Mn+0.2%Cr+0.3%RE时,复合材料的抗拉强度、屈服强度和伸长率达到379 MPa,297 MPa和7.5%,分别提高了32.5%,37.5%和59.5%;其断裂形式属韧性断裂;其强化机制主要有Orwan强化、细晶强化、固溶强化和位错强化.
(Al_2O_3+Al_3Zr)_p/A356 composites were synthesized by micro-alloying and melt in-situ reaction technology. The effect of micro-alloying on microstructure and mechanical properties of the composites was investigated. The results indicate that the reinforced particulates Al_2O_3and Al_3Zr of the composites after alloying became smaller with the size at about 0. 5-2μm, the distribution became more homogeneous, the morphology became spherical and the surrounding was blunt. The mechanical properties of the composites were greatly enhanced, compared with that of the composites without alloying element addition. The tensile strength, yield strength and elongation of the (Al_2O_3+Al_3Zr)_p/A356 composites reached 379 MPa, 297 MPa and 7. 6%, which increased 32.5%,37.5% and 59.5% respectively, after 0.2wt%Mn, 0.2wt%Cr and 0.3wt%RE were added. The fracture of the composites was ductile fracture. The strengthening mechanisms included Orowan strengthening,grain-refined strengthening, solid-solution strengthening and dislocation strengthening.
参考文献
| [1] | 宋伟.金属基复合材料的发展与应用[J].铸造设备研究,2004(05):48-50. |
| [2] | 韩海军.金属基复合材料的研究现状[J].科技情报开发与经济,2005(19):171-172. |
| [3] | Ungar T. .Dislocation densities, arrangements and character from X-ray diffraction experiments[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(0):14-22. |
| [4] | 赵玉涛,孙国雄.Al-ZrOCl2体系原位生成Al3Zr的孪晶生长[J].材料研究学报,2001(04):420-424. |
| [5] | 孙洪强 .微合金化与原位颗粒协同作用铝基复合材料的组织与性能[D].江苏大学,2007. |
| [6] | 章照,赵玉涛,程晓农,戴起勋,陈刚.Al-Zr-B体系反应合成复合材料的组织和性能[J].特种铸造及有色合金,2006(08):512-514. |
| [7] | 李斗星,周朝霞,樊中云.通过基体合金化制备界面相容的Al2O3p/Al颗粒增强铝基复合材料[J].金属学报,2002(06):602-608. |
| [8] | Y. Zhang;N. Ma;H. Wang .Effect of Ti and Mg on the damping behavior of in situ aluminum composites[J].Materials Letters,2005(28):3775-3778. |
| [9] | Olivier Beffort;Siyuan Long;Cyril Cayron;Jakob Kuebler;Philippe-Andre Buffat .Alloying effects on microstructure and mechanical properties of high volume fraction SiC-particle reinforced Al-MMCs made by squeeze casting infiltration[J].Composites science and technology,2007(3/4):737-745. |
| [10] | 贺永东,张新明.微量Cr、Mn、Ti、Zr细化7A55铝合金铸锭组织的效果与机理[J].中国有色金属学报,2005(10):1594-1601. |
| [11] | 赵玉涛,孙建祥,戴起勋,程晓农,林东洋.Al-Zr（CO3）2体系反应合成复合材料的反应机制及动力学模型[J].中国有色金属学报,2005(09):1343-1349. |
| [12] | 张树瑜,柴跃生.原位TiB2/Al复合材料形核机制[J].特种铸造及有色合金,2002(04):6-8. |
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