Al_(3)Ti/Al-Si-Cu-V-Zr合金复合材料显微组织及拉伸性能  

Microstructure and Tensile Properties of Al_(3)Ti/Al-Si-Cu-V-Zr Alloy Composites

作　　者：曾广凯 崔君阁 王雨辰 陈凯伦 潘森鑫 潘利文 胡治流 ZENG Guangkai;CUI Junge;WANG Yuchen;CHEN Kailun;PAN Senxin;PAN Liwen;HU Zhiliu(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Nanning 530004,China;Guangxi Eco-type Aluminum Industry Collaborative Innovation Center,Nanning 530004,China)

机构地区：[1]广西大学资源环境与材料学院,南宁530004 [2]广西有色金属及特色材料加工重点实验室,南宁530004 [3]广西生态型铝产业协同创新中心,南宁530004

出　　处：《材料导报》2022年第8期148-152,共5页Materials Reports

基　　金：广西有色金属及特色材料加工重点实验室材料加工专项(2021GXMPSF04);南宁市科技发展计划(20171005-1);广西大学科研基金项目(XJZ100343);广西大学大学生创新创业训练计划(202010593056)。

摘　　要：本工作在Al-Si-Cu-V-Zr合金熔体中加入K_(2)TiF_(6)盐,通过熔体原位反应法引入不同含量的Al_(3)Ti强化相,研究了铸态x Al_(3)Ti/Al-Si-Cu-V-Zr合金复合材料的显微组织和力学性能。结果表明,该复合材料由α-Al、共晶Si、Al_(2)Cu、(Al,Si)_(3)M((Al,Si)_(3)(Zr,V)、(Al,Si)_(3)(Ti,Zr,V))相组成,随着K_(2)TiF_(6)盐添加量的增加,(Al,Si)_(3)M相由长片状变为等轴颗粒状,α-Al枝晶变得更均匀细小,长条状共晶硅转变成细小的短纤维状,共晶硅长径比和(Al,Si)_(3)M相平均粒径减小。引入Al_(3)Ti强化相后铝基复合材料的拉伸性能均得到了提高,含6%(质量分数,下同)Al_(3)Ti的复合材料的室温拉伸性能最佳,抗拉强度和屈服强度分别达到239.3 MPa和85.3 MPa,比未引入Al_(3)Ti基体的合金分别提高了28.6%和28.8%。分析表明,残余液相中的Al_(3)Ti相通过细化共晶组织中的α-Al相而间接地细化了共晶硅,这是共晶相细化的原因;细化的共晶硅短纤维增强和细小(Al,Si)_(3)M的颗粒增强是复合材料力学性能提高的主要原因,而粗大的(Al,Si)_(3)M脆性相不利于复合材料力学性能的提高。In this work,K_(2)TiF_(6)salt was added into the Al-Si-Cu-V-Zr alloy melt,and the Al_(3)Ti strengthening phases of different contents were introduced into Al-Si-Cu-V-Zr alloy through the melting in-situ reaction method.The microstructure and mechanical properties of the as-cast x Al_(3)Ti/Al-Si-Cu-V-Zr composite were studied.The results showed that the composite was composed ofα-Al,eutectic Si,Al_(2)Cu and(Al,Si)_(3)M((Al,Si)_(3)-(Zr,V),(Al,Si)_(3)(Ti,Zr,V))phases.With the addition of K_(2)TiF_(6)salt increasing,the(Al,Si)_(3)M phase changed from strip to equiaxed particle,and theα-Al phase turned more fine and the strip eutectic silicon changed into the fine short fiber.The aspect ratio of eutectic silicon and the ave-rage particle size of(Al,Si)_(3)M phase decreased with K_(2)TiF_(6)salt addition increasing.The tensile properties of aluminum matrix composites were improved after introducing(Al,Si)_(3)M reinforcing phase.The tensile strength and yield strength of composites containing 6wt%Al_(3)Ti were 239.3 MPa and 85.3 MPa,respectively,28.6%and 28.8%higher than those of the matrix alloys.It was found that the Al_(3)Ti phase in the residual liquid phase indirectly refined the eutectic silicon by refining theα-Al in the eutectic structure.Fine and short fiber eutectic silicon reinforcement and fine(Al,Si)_(3)M particle reinforcement were the main reasons for the improvement of the mechanical properties of the composites,while coarse(Al,Si)_(3)M brittle phase was harmful to the improvement of mechanical properties.

关 键 词：AL-SI-CU合金 平均粒径 长径比 显微组织 拉伸性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]