刘越,屈光.纳米B4CP/2009Al复合材料固溶时效行为与性能研究[J].稀有金属材料与工程,2017,46(10):2950~2956.[LIU Yue,QU Guang.Mechanical properties and solution treatment and aging behavior of nano-B4CP/2009Al composite[J].Rare Metal Materials and Engineering,2017,46(10):2950~2956.]
纳米B4CP/2009Al复合材料固溶时效行为与性能研究
投稿时间:2016-09-06  修订日期:2017-05-03
中文关键词:  纳米B4CP  2009Al复合材料  固溶处理  时效行为  力学性能
基金项目:国家自然科学基金资助(项目号51334004);辽宁省科技创新重大专项(201404001)
中文摘要:
      采用粉末冶金+热挤压法制备了纳米B4CP(n-B4CP)含量分别为2、4、6vol.% n-B4CP/2009Al复合材料,运用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和维氏硬度测量仪等方法研究了n-B4CP体积分数对n-B4CP/2009Al复合材料的微观组织、固溶时效行为及力学性能的影响。结果表明:复合材料经热挤压后组织致密均匀,n-B4CP体积分数的增加没有明显增加复合材料孔隙率;复合材料经495℃固溶1h处理后,仅存在少量析出相(Al2Cu)残留基体中;经固溶淬火后175℃人工时效14h后,2、4、6vol.% n-B4CP/2009Al复合材料同时达到峰值硬度,比基体合金达到峰值硬度的时间提前了2h;利用TEM观察时效后的微观组织表明,n-B4CP的加入抑制了基体中析出相(Al2Cu)的长大,大量细小析出相的存在使复合材料达到峰时效的时间提前;经最佳热处理工艺处理后的复合材料,随着n-B4CP体积分数的增加,复合材料的抗拉强度先上升后下降,屈服强度始终呈上升趋势,高体积分数的n-B4CP有效的起到钉扎位错的作用,但是高体积分数n-B4CP产生的颗粒团聚现象导致复合材料提早开裂。
Mechanical properties and solution treatment and aging behavior of nano-B4CP/2009Al composite
英文关键词:B4C nanoparticles  2009 aluminum matrix composite  solution treatment  aging behavior  mechanical properties
英文摘要:
      Nano-B4CP particulates (n-B4CP) reinforced 2009Al matrix composites with different reinforcement volume fractions (0, 2, 4 and 6vol.%) were fabricated by powder metallurgy combined with hot extrusion. The effects of different volume fractions of n-B4CP on microstructure, solution and aging behavior and mechanical properties of n-B4CP/2009Al composites were studied by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), vickers hardness measuring instrument and so on. The results show that, the n-B4CP were uniformly dispersed in the composites after hot extrusion process. The best solution temperature and time of the composites were 495℃ and 1 h, the resolution of second phase particles (Al2Cu) were dissolved back into the matrix and only a small amount remaining in the matrix during solution treatment process. N-B4CP/2009Al composites with different volume fractions (0, 2, 4 and 6vol.%) treated at 495℃ for 1h and then ageing at 175℃for 14h almost simultaneously reached the peak hardness, and the aging peak time decreased 2h compared to matrix alloy. After peak aging, the microstructure of composites were observed by TEM, indicating that the growth of precipitation was strongly restrained due to the addition of n-B4CP particulates. Compared to the matrix alloy, the composites with higher density of ?ner precipitates led to an earlier attainment in the peak aging condition. After the optimum heat treatment process, the tensile strength of the composites increases at first and then decreases along with the increasing of n-B4CP volume fraction, while the yield strength always increases. High volume fraction of n-B4CP effectively play the role of pinning dislocations, but the phenomenon of agglomeration of high volume fraction of n-B4CP results in composites’ early cracking.
作者单位E-mail
刘越 东北大学 材料科学与工程学院 liuyue@smm.neu.edu.cn 
屈光 东北大学 材料科学与工程学院  
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