尚海龙,马冰洋,李荣斌,李戈扬.Al-TiB2纳米晶薄膜中的反Hall-Petch效应[J].稀有金属材料与工程,2019,47(3):835~840.[Shang Hailong,Ma Bingyang,Li Rongbin,Li Geyang.The Experiment Confirmation of the Inverse Hall-Petch Effect in Al-TiB2 Nanocrytalline Films[J].Rare Metal Materials and Engineering,2019,47(3):835~840.]
Al-TiB2纳米晶薄膜中的反Hall-Petch效应
投稿时间:2017-08-09  修订日期:2019-01-17
中文关键词:  Al-TiB2纳米晶  反Hall-Petch效应  多层膜  硬度
基金项目:国家自然科学基金资助(项目号:51401120, 51671125)
中文摘要:
      多种微结构因素作用的相互交织使纳米晶合金中是否存在与纯金属类似的反Hall-Petch现象难以得到实验证实。本文选用Al-TiB2体系,采用二维结构纳米多层膜的方法,实现了对晶粒尺寸因素的孤立和使其独立地改变,研究了晶粒尺寸对薄膜力学性能的作用规律。结果表明:Al-TiB2过饱和固溶纳米晶薄膜也与纳米晶纯金属Al一样,存在硬度随晶粒尺寸减小从遵从Hall-Petch关系提高转变为偏离Hall-Petch关系,并进一步出现反Hall-Petch效应的三个阶段,实验得到了偏离Hall-Petch关系为32nm,产生反Hall-Petch现象的临界晶粒尺寸为8nm,这两个临界晶粒尺寸与分子动力学方法对纳米晶纯金属Al计算的结果相当。
The Experiment Confirmation of the Inverse Hall-Petch Effect in Al-TiB2 Nanocrytalline Films
英文关键词:Al-TiB2 nanocrystals  inverse Hall-Petch effect  multilayer films  hardness
英文摘要:
      The effect of grain size in nanocrystalline alloys is difficult to reveal experimentally because challenges of controlling a number of other microstructure factors. This paper designed and prepared a series of multilayered films with Al-TiB2 crystalline layers of different thickness but with amorphous layers of identical thickness. In these multilayered films, the heights of columnar crystals in crystalline layers were controlled from 8 to 128nm and their diameters kept at ~15 nm, independent of their heights. This design achieved the control of grain size, independent from other microstructure factors. The analysis of mechanical properties of these multilayered films showed that the inverse Hall-Petch phenomenon also exists in Al-TiB2 nanocrystalline alloys , as nanorystalline pure Al. The critical grain sizes of deviation from the Hall-Petch relationship and the inverse Hall-Petch phenomenon are approximately 32 nm and 8 nm respectively. These critical grain sizes are similar to those reports in nanorystalline pure Al by molecular dynamic simulations.
作者单位E-mail
尚海龙 上海电机学院机械学院 shanghl@sdju.edu.cn 
马冰洋 上海电机学院机械学院  
李荣斌 上海电机学院机械学院  
李戈扬 上海交通大学金属基复合材料国家重点实验室  
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