Microstructure and Mechanical Properties of TiB-Containing Al–Zn Binary Alloys  

作　　者：Sang-Soo Shin Gil-Yong Yeom Tae-Yang Kwak Ik-Min Park 

机构地区：[1]Department of Materials Science and Engineering, Pusan National University, Busan 609-735, Republic of Korea [2]Liquid Processing & Casting Technology R&BD Group, Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea

出　　处：《Journal of Materials Science & Technology》2016年第7期653-659,共7页材料科学技术（英文版）

基　　金：The 2015 National Research Laboratory Program and grant-inaid program of the National Core Research Center provided by the Korea Ministry of Science and Technology and the Korea Science and Engineering Foundation(No.2013M3A6B107889)supported this study

摘　　要：The microstructure and mechanical properties of newly developed Al-35Zn cast alloys with TiB refiner addition were evaluated by X-ray diffractometry, optical microscopy, and scanning electron microscopy coupled with energy dispersive spectrometry. The microstructure of these alloys featured α-Al den- drites surrounded by AI-Zn （α ＋ rI） eutectic structures. After the addition of TiB refiner, the alloy grain sizes decreased, and its morphology abruptly changed from dendritic to equiaxed grains. Such an im- proved microstructure of the modified alloys was accompanied by a significant increase in the tensile strength and elongation percentage compared to those of the AI-Zn or Zn-Al-based alloys. The results showed that with the increase of TiB content up to 0.05%, the morphology of α-Al dendrites and α ＋ T1 phases changed from coarse dendrite and lamellar structures into independent and fine ones. Based on these results, the effect of TiB refiner addition on the microstructure and mechanical properties of the AI-35Zn binary alloys was investigated.The microstructure and mechanical properties of newly developed Al-35Zn cast alloys with TiB refiner addition were evaluated by X-ray diffractometry, optical microscopy, and scanning electron microscopy coupled with energy dispersive spectrometry. The microstructure of these alloys featured α-Al den- drites surrounded by AI-Zn （α ＋ rI） eutectic structures. After the addition of TiB refiner, the alloy grain sizes decreased, and its morphology abruptly changed from dendritic to equiaxed grains. Such an im- proved microstructure of the modified alloys was accompanied by a significant increase in the tensile strength and elongation percentage compared to those of the AI-Zn or Zn-Al-based alloys. The results showed that with the increase of TiB content up to 0.05%, the morphology of α-Al dendrites and α ＋ T1 phases changed from coarse dendrite and lamellar structures into independent and fine ones. Based on these results, the effect of TiB refiner addition on the microstructure and mechanical properties of the AI-35Zn binary alloys was investigated.

关 键 词：Al-Zn（-Cu） alloyEutectic structureHigh strengthTiB2 

分 类 号：TG146.21[一般工业技术—材料科学与工程]