摘要
采用微合金化的方法,研究了稀土元素Sc对Al-Bi偏晶合金凝固组织及耐磨性的影响。通过OM、SEM、TEM、XRD多功能材料表面性能测试仪等设备对试样进行检测分析。结果表明:微量Sc元素的加入降低了富Bi相的形核能,增加了形核位置,有效地改善了富Bi相的成分偏析现象,减小了Al基体的晶粒大小。同时微量Sc元素能显著提高Al-Bi合金的硬度及摩擦系数,当Sc含量在0.25 wt%时硬度与摩擦系数皆取得极大值,此时较未加Sc时,硬度提升了109%,摩擦系数提升了33%。当Sc的含量增加到1 wt%时,试样中发现了密集的Al3Sc相,具有规则的几何轮廓,并且有明显的偏聚行为。富Bi相与Al3Sc相两种相单独析出,互不干涉。
The effects of rare earth element Sc on the solidification structure and wear resistance of Al-Bi partial crystal alloy were studied by microalloying method.The samples were tested and characterized by OM,SEM,TEM,multifunctional surface properties tester and other equipment.The results show that the addition of trace Sc element reduces the form energy of the Bi-rich phase and increases the nucleation position.It effectively eliminates the component segregation of the Bi-rich phase,and reduces the grain size of the Al matrix.At the same time,trace Sc element can significantly improve the hardness and friction coefficient of Al-Bi alloy,when the content of Sc is 0.25 wt%,the hardness and friction coefficient can reach the maximum value.Compared with without Sc,the hardness is increased by 109%,and the friction coefficient is increased by 33%.When the content of Sc increased to 1 wt%,a dense Al 3Sc phase was found in the sample,with a regular geometric profile and obvious segregation behavior.The two phases of Bi-rich phase and Al 3Sc phase are precipitated separately and do not interfere with each other.
作者
杨志彬
常江
成洁
鞠晓婷
李智翔
余建波
YANG Zhibin;CHANG Jiang;CHENG Jie;JU Xiaoting;LI Zhixiang;YU Jianbo(School of Metallurgical Engineering,Jiangsu University of Science and Technology,Zhangjiagang 215600,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)
出处
《有色金属工程》
CAS
北大核心
2024年第6期17-25,共9页
Nonferrous Metals Engineering
基金
张家港市科技计划项目(社会发展)(ZKS2104)
冶金减排与资源综合利用教育部重点实验室开放基金(JKF21-01)
上海大学高品质特殊钢冶金与制备国家重点实验室上海市钢铁冶金新技术开发应用重点实验室开放课题项目(SKLASS2021-01)。
关键词
偏晶合金
微观组织
摩擦系数
析出相
partial crystalline alloy
microstructure
coefficient of friction
precipitated phase
