摘要
制备了一种新型Al-Ti-La中间合金,用来细化变质处理亚共晶Al-7Si合金中的α-Al和共晶Si相。研究了新型Al-Ti-La中间合金对亚共晶Al-7Si合金显微组织和力学性能的影响。结果表明:新型Al-Ti-La中间合金对初生α-Al和共晶Si表现出优异的细化变质效果。加入0.2%Al-Ti-La,可以使α-Al晶粒尺寸从1460μm减小到230μm,减小了84.25%;二次支晶臂间距从28.55μm减小到15.16μm,减小了46.90%;共晶Si的形貌由粗大的针片状转变为细小的短棒状和颗粒状。随着初生α-Al和共晶Si相的细化,Al-7Si合金的抗拉强度从154 MPa增加到175 MPa,增加了13.63%;伸长率从5.83%增加到11.94%,增加了104.80%。断裂方式由穿晶断裂向沿晶断裂转变,合金的塑韧性提高。
A new Al-Ti-La master alloy was prepared to refine theα-Al and eutectic Si phases in the hypoeutectic Al-7Si alloy.The effects of a new Al-Ti-La master alloy on the microstructure and mechanical properties of hypoeutectic Al-7Si alloy were studied.The results show that the prepared Al-Ti-La master alloy exhibits excellent refining and modification effects on primaryα-Al and eutectic Si.The addition of 0.2%Al-Ti-La can reduce the grain size ofα-Al from 1460μm to 230μm,which has a reduction of 84.25%;the secondary arm spacing is reduced from 28.55μm to 15.16μm,which has a reduction of 46.90%.The morphology of eutectic Si changed from coarse needle flakes to fine short rods and granules.With the refinement of the primaryα-Al and eutectic Si phases,the tensile strength of the Al-7Si alloy increased from 154 MPa to 175 MPa,with an increase of 13.63%;the elongation increased from 5.83%to 11.94%,an increase of 104.80%.The fracture mode changes from trans granular fracture to intergranular fracture,and the plastic toughness of the alloy is improved.
作者
丁万武
苟璐珉
DING Wanwu;GOU Lumin(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《有色金属工程》
CAS
北大核心
2022年第11期7-14,共8页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(52161006)
甘肃省教育厅产业支持计划项目(2021CYZC-23)
甘肃省重点研发计划项目(21YF5GD183)
嘉峪关科技计划项目(21-10)
中国博士后科学基金项目(2019M653896XB)。
