Al-5Nb-B细化剂对Al-12Si合金组织与性能的影响
Effects of Al-5Nb-B Refiner on Microstructure and Properties of Al-12Si Alloy
张向东 1郭永春 1夏峰 1李建平1
作者信息
- 1. 西安工业大学 材料与化工学院,陕西 西安 710021
- 折叠
摘要
采用氟盐法制备了Al-5Nb-B晶粒细化剂,将所制备的细化剂按不同含量(0.0wt%、1.5wt%、3.0wt%、4.5wt%)分别添加到Al-12Si合金中.采用光学显微镜、扫描电镜对添加不同含量晶粒细化剂的Al-12Si合金的显微组织进行观察,并在电子万能试验机(D2-02001)上进行室温力学性能测试.研究了Al-5Nb-B晶粒细化剂对近共晶Al-12Si合金显微组织与拉伸性能的影响.结果表明:氟盐法制备的Al-5Nb-B晶粒细化剂主要包含平均尺寸为 20 μm的Al3Nb颗粒和5μm的NbB2 颗粒.随着Al-5Nb-B晶粒细化剂含量的增大,Al-12Si合金中α-Al晶粒尺寸由未添加的1864 μm减小到396 μm,铸态合金的抗拉强度由 128 MPa增大到 145 MPa,且断后伸长率由 6.9%提高到 9.8%.氟盐法制备的Al-5Nb-B晶粒细化剂提高了NbB2 在Al-12Si合金熔体中的形核数,有效细化了α-Al基体,提高了合金力学性能.
Abstract
The Al-5Nb-B grain refiner was prepared by fluorinated salt method,and the prepared refiner was added to Al-12Si alloy with different contents(0.0wt%,1.5wt%,3.0wt%,4.5wt%).Optical microscopy and scanning electron microscopy were used to observe the microstructure of Al-12Si alloy with different grain refiners,and the mechanical properties were tested at room temperature in an electronic universal testing machine(D2-02001).The effects of Al-5Nb-B grain refiner on the microstructure and tensile properties of near-eutectic Al-12Si alloy were studied.The results show that the Al-5Nb-B grain refiner prepared by fluorinated salt method mainly contains Al3Nb particles with an average size of 20 μm and NbB2 particles with an average size of 5 μm.With the increase of the Al-5Nb-B grain refiner content,the α-Al grain size in Al-12Si alloy decreases from 1864 μm without addition to 396 μm,the tensile strength of as-cast alloy increases from 128 MPa to 145 MPa,and the elongation after fracture increases from 6.9%to 9.8%.The Al-5Nb-B grain refiner prepared by the fluorinated salt method increases the nucleation number of NbB2 in the Al-12Si alloy melt,effectively refines the α-Al matrix,and improves the mechanical properties of the alloy.
关键词
Al-5Nb-B晶粒细化剂/Al-Si合金/显微组织/力学性能Key words
Al-5Nb-B refiner/Al-Si alloy/microscopic structure/mechanical property引用本文复制引用
基金项目
西安市智能兵器重点实验室项目(2019220514SYS020CG042)
陕西省重点研发计划(2020ZDLGY13-01)
出版年
2024
NETL
NSTL
万方数据