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原位纳米 ZrB 2 颗粒增强 7085 铝合金的 微观组织与力学性能研究
Research on the Microstructure and Mechanical Properties of 7085 Aluminum Alloy Reinforced by In-situ ZrB 2 Nanoparticles
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- DOI:
- 作者:
- 怯喜周，王宇慧 ，彭艳杰 ，杨子易 ，陈 刚 ，许晓静
KAI Xizhou ，WANG Yuhui ， PENG Yanjie ，YANG Ziyi , CHEN Gang ， XU Xiaojing
- 作者单位:
- 江苏大学 材料科学与工程学院，江苏 镇江 212000；江苏大学 先进制造与现代装备技术工程研究院，江苏 镇江 212013
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212000, China; Institute for Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang 212013, China
- 关键词:
- 原位纳米 ZrB 2 颗粒； 7085 铝合金；稀土 Sc ；力学性能
in-situ ZrB 2 nanoparticle; 7085 aluminum alloy; rare earth Sc; mechanical property
- 摘要:
- 本文通过原位合成技术，成功制备了纳米 ZrB 2 颗粒增强 7085 铝合金基复合材料。 采用金相显微镜、扫描电子显微镜、透射电子显微镜、 X 射线衍射仪进行表征，并进行力学性能测试，研究了 ZrB 2 纳米增强体对 7085 铝合金的显微组织和力学性能的影响。 结果表明， ZrB 2 纳米增强体可以显著提高 7085 铝合金的强度。 但是随着增强体体积分数增大， ZrB 2 颗粒团聚现象加剧，不利于复合材料的塑韧性提高。 同时，在复合材料中引入微量稀土元素 Sc 可使纳米ZrB 2 颗粒团聚现象得到改善，并进一步细化基体晶粒，使复合材料的强度和延长率都得到提高。 当 ZrB 2 含量为 2%( 体积分数 ) 、 Sc 含量为 0.4%( 质量分数 ) 时，复合材料的抗拉强度为 534 MPa 、伸长率为 10.2% ，相较于 7085 铝合金基体分别提高了 17.4% 、 14.6% 。In this study, in-situ ZrB 2 reinforced 7085 aluminum matrix composites were fabricated via an in-situ synthesis technique. The influence of ZrB 2 nanoparticles on the microstructure and mechanical properties was investigated by optical microscope (OM), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffractometer (XRD) and tensile testing. The results indicate that the strength could be markedly improved by ZrB 2 nanoparticle reinforcement. However, agglomeration of ZrB 2 nanoparticles is aggravated with the volume fraction of ZrB 2 nanoparticles, which is harmful to improving the plasticity and toughness of the composite. Thus, to solve this problem, rare earth elements were introduced into composite materials. The results show that the agglomeration of ZrB 2 particles is improved and the matrix grains are refined significantly. Moreover, the strength and elongation are enhanced. When the volume fraction of ZrB 2 is 2% and mass fraction of Sc is 0.4%, the ultimate tensile strength and elongation of the composite are 534 MPa and 10.2%, respectively, which are approximately17.4% and 14.6% higher than those ofthe 7085 aluminum alloymatrix.