李翠玲,喇培清,刘辉,魏玉鹏,卢学峰,陈经民

• 1:兰州理工大学甘肃省有色金属新材料国家重点实验室

摘要(Abstract)：

在800℃下对铝热反应法制备的含10%Ni的纳米晶Fe3Al材料进行了不同时间的等温热处理,保温时间分别为4、8、12、16、20、24和48 h。利用XRD和TEM分析了不同保温时间下材料的平均晶粒尺寸,并对硬度进行了测试,研究了晶粒尺寸变化趋势以及硬度变化规律,探讨了两者之间的变化关系。结果表明:材料的平均晶粒尺寸在不同时间的退火处理后,呈现出两次减小,两次增大,最后趋于平稳的过程。晶粒尺寸在4 h等温处理后达到最小值16 nm,在24 h等温处理后达到最大值35 nm。存在一个临界值dc=20 nm,当晶粒尺寸小于dc时,维式硬度和晶粒尺寸之间满足反Hall-Petch关系,当晶粒尺寸大于dc时,两者之间呈现正的Hall-Petch关系。16 h退火处理后维氏硬度最大为490 HV,24 h退火后维氏硬度最小为410 HV。

关键词(KeyWords)： 纳米晶Fe3Al;退火时间;晶粒尺寸;维式硬度;Hall-Petch关系

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50674051)

作者(Author): 李翠玲,喇培清,刘辉,魏玉鹏,卢学峰,陈经民

DOI: 10.13289/j.issn.1009-6264.2012.04.007

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