Al-Ti-B微观组织对7085铝合金细化效果的影响
Effect of Al-Ti-B microstructure on refining 7085 aluminum alloy
李学伟 1岂心亮 1权新虎 1齐佰良 1郭永超 1张宇1
作者信息
- 1. 黑龙江科技大学 材料科学与工程学院,哈尔滨 150022
- 折叠
摘要
为比较三种Al-Ti-B的微观组织对7085 铝合金晶粒尺寸、硬度及电导率的影响,利用金相显微镜、SEM、维氏硬度计和涡流导电仪等检测设备,研究了经Al-Ti-B中间合金细化后的7085 铝合金显微组织与力学性能.结果表明:三种Al-Ti-B中的TiAl3、TiB2 相形貌与平均尺寸无明显差异,微观组织缺陷较少.两种Al-5Ti-0.2B中TiB2 粒径尺寸分布区间较窄的细化效果较优,将Zr质量分数为0.1%的7085 铝合金晶粒细化至168 μm;Al-5Ti-1B中TiB2 粒径分布区间较窄且含量较高,可将该合金晶粒细化至112 μm.窄的粒径分布区间、高的拟合度、异质形核核心数量的提升对细化效果产生积极作用,一定程度抑制了Zr"毒化"现象,改善了硬度及电导率性能.
Abstract
This paper intends to compare the different effects of microstructures of the three kinds of Al-Ti-B master alloy on the grain size,hardness,and electrical conductivity of 7085 aluminum alloy.The study is enabled by investigating the microstructures and mechanical properties of 7085 aluminum alloy refined by Al-Ti-B master alloy by using metallographic microscope,SEM,Vickers hardness tester,and eddy current conductivity meter.The results show that there is no significant difference in the morphology and average size of TiAl3 and TiB2 phases in three kinds of Al-Ti-B alloys,and there are fewer micro-structural defects.The better refinement effect lies in distribution range of TiB2 particle of the two Al-5Ti-0.2B alloys with narrower size,which refines the grain size of 7085 aluminum alloy with Zr content of 0.1%to 168 μm.TiB2 particles of Al-5Ti-1B alloy with narrower size distribution range and higher con-tent can refine grain size of the alloy to 112 μm.The narrower particle size distribution range,the high fitting degree and the increase of the core number of the heterogeneous nucleation inhibit Zr"poisoning"phenomenon and improve the hardness and conductivity properties,as which have positive effect on the refinement.
关键词
7085铝合金/Al-Ti-B中间合金/TiB2粒径/晶粒细化Key words
7085 aluminum alloy/Al-Ti-B master alloy/TiB2 particle size/grain refinement引用本文复制引用
基金项目
国家级大学生创新创业训练计划项目(202310219042X)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据