L12型Al67Cu8Ti25细化剂的制备及其对铝合金组织的影响
Preparation of L12-Al67Cu8Ti25 Refiner and Effects on Microstructure of Aluminum Alloys
陈旭 1席卫国 1陈吉 1程婧璠 1蔡启舟 1蒋文明1
作者信息
- 1. 华中科技大学材料科学与工程学院,材料成形与模具技术全国重点实验室,武汉 430074
- 折叠
摘要
采用单质粉末通过高能球磨和真空烧结制备了L12 型Al67Cu8Ti25 金属间化合物,并将其破碎后与Al粉进行混合制备了Al-25Al67Cu8Ti25复合细化剂.研究了球磨时间、烧结温度对制备L12型Al67Cu8Ti25金属间化合物的影响.以纯铝和Al-5Cu-Mn铸造铝合金为对象,研究了复合细化剂对α-Al宏观和微观组织的影响及作用机制.结果表明,球磨粉末在600℃下烧结可制备单相的L12 型Al67Cu8Ti25化合物颗粒,随着球磨时间增加,烧结形成的化合物颗粒的平均尺寸减小至11 μm,形貌趋于球形.Al-25Al67Cu8Ti25复合细化剂对α-Al具有较好的细化效果,加入0.25%的Al67Cu8Ti25 细化剂后,纯铝及Al-5Cu-Mn合金的晶粒尺寸分别细化至224 μm和137 μm.L12 型Al67Cu8Ti25 化合物是α-Al的有效形核质点,与α-Al的错配度为 2.35%,相比于Al3Ti,其错配度更小,异质形核能力更强.
Abstract
The L12-Al67Cu8Ti25 intermetallic compound was prepared by high-energy ball milling and vacuum sinter-ing,which was crushed and mixed with Al powder to fabricate Al-25Al67Cu8Ti25 compound refiner.The influence of milling time and sintering temperature on the preparation of L12-Al67Cu8Ti25 intermetallic compounds were investigated.Taking pure aluminum and Al-5Cu-Mn cast aluminum alloys as objects,effects of compound refiners on the macro-structure and microstructure of α-Al as well as the action mechanism were investigated.The results indicate that the single-phase L12-Al67Cu8Ti25 compound particles are fabribated by sintering the powder at 600℃.With the increase of milling time,the average size of sintered compounds is decreased to 11 μm,and the morphology tends to be spherical.Al-25Al67Cu8Ti25 compound refiner has a desirable refining effect on α-Al,and the grain size of pure aluminum and Al-5Cu-Mn alloys are refined to 224 μm and 137 μm,respectively,after adding 0.25%Al67Cu8Ti25 compound refiner.L12-Al67Cu8Ti25 compound can act as an effective nucleation of α-Al with a mismatch degree of 2.35%,which is less than that of Al3Ti,leading to stronger heteronuclear ability.
关键词
L12型Al67Cu8Ti25金属间化合物/显微组织/晶粒细化/异质形核Key words
L12-Al67Cu8Ti25 Intermetallic Compound/Microstructure/Grain Refinement/Heterogeneous Nucleation引用本文复制引用
基金项目
国家自然科学基金资助项目(52075198)
出版年
2024
NETL
NSTL
万方数据