吴庆捷,闫洪,刘渊,胡志.Sr对合成Al3Ti/ADC12复合材料微观组织与力学性能的影响[J].稀有金属材料与工程,2018,47(3):742~747.[Qing-jie Wu,Hong Yan,Yuan liu,Zhi Hu.Effect of Sr Modification on Microstructures and Mechanical Properties of Al3Ti/ADC12 Composites[J].Rare Metal Materials and Engineering,2018,47(3):742~747.]
Sr对合成Al3Ti/ADC12复合材料微观组织与力学性能的影响
投稿时间:2016-05-04  修订日期:2016-07-05
中文关键词:  Sr变质  Al3Ti/ADC12复合材料  显微组织  力学性能  断口
基金项目:
中文摘要:
      本文研究了不同含量的改性剂Sr对原位合成Al3Ti/ADC12复合材料微观组织及力学性能的影响。通过光学显微镜以及扫描电镜观察复合材料的微观以及断口组织。实验结果表明:Sr的加入能有效减小α-Al以及Al3Ti颗粒尺寸以及优化材料形态。Sr的最优加入量为0.25 wt%。在该加入量条件下,共晶硅由针状或短棒状变为颗粒状,α-A1粗枝晶得到较好的细化。实验结果也显示:Sr的加入有效提升了复合材料的机械性能。当加入0.25 wt% Sr时,抗拉强度以及延伸率相较于基体材料增加了36.9% 和 58%。断口形貌表明,在最优加入量条件下所制备的复合材料断口几乎看不到解理面和脆性平坦区,韧窝数量增多,形貌尺寸变得更小且深,同时分布也较为均匀。断口形貌的变化符合材料力学性能变化。
Effect of Sr Modification on Microstructures and Mechanical Properties of Al3Ti/ADC12 Composites
英文关键词:Sr Modification  Al3Ti/ADC12 composites  Microstructures  Mechanical properties  Fracture.
英文摘要:
      The effects of Sr modification on the microstructure and properties of Al3Ti/ADC12 composite were systematically investigated. The microstructures and fracture surfaces of composites were examined by optical microscope and SEM. Results showed that the addition of Sr reduced the sizes of the α-Al primary phase and Al3Ti particles and modified the morphology of composites. The optimum level of added Sr content was 0.25 wt%, and the eutectic silicon changed from a acicular or short rod shape into a granule one. Coarse dendritics of the primary α-A1 phases were fully refined. Results also showed that Sr addition led to the improvement inSmechanical properties. Compared with matrix alloys, the tensile strength and elongation of the composite were increased by 36.9% and 58% when the Sr addition was 0.25 wt.%. Furthermore, fractographic examinations revealed that cleavage surfaces and brittle plain area could hardly be seen from the Al3Ti/ADC12 composite with addition of 0.25wt.% Sr. The dimples were increased in quantity and diminished in size, deeper and well-distributed. The fracture appearances matched the tendency of the tensile properties.
作者单位E-mail
吴庆捷 南昌大学机电工程学院材料加工工程系 wu856200@163.com 
闫洪 南昌大学机电工程学院材料加工工程系 yanhong_wh@163.com 
刘渊 南昌大学机电工程学院材料加工工程系  
胡志 南昌大学机电工程学院材料加工工程系  
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