Al-7Si-0.35Mg合金的强韧化设计  

Strengthening and Toughening Design of Al-7Si-0.35Mg Alloy

作　　者：王旭 李道秀 赵凯 刘桂亮 孙谦谦[1] 韩梦霞 钱钊[1] 刘相法[1] Wang Xu;Li Daoxiu;Zhao Kai;Liu Guiliang;Sun Qianqian;Han Mengxia;Qian Zhao;Liu Xiangfa(Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education),Shandong University)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061

出　　处：《特种铸造及有色合金》2023年第9期1246-1251,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52071189,52171182);山东省重大科技创新工程资助项目(2021ZLGX01);山东大学青年学者未来计划资助项目。

摘　　要：采用Al-TCB晶种合金(TCB指B掺杂型TiC以及C掺杂型TiB_(2)两种粒子的简称)对Al-7Si-0.35Mg合金(A356合金)进行强韧化设计,通过直读式光谱仪、光学显微镜、场发射扫描电镜、万能试验机等对A356铝合金的化学成分、微观组织及力学性能进行了测试和分析。结果表明,Al-TCB晶种合金不仅具有优异的抗Si致细化“中毒”能力,而且还可以通过调整加入量对该合金实现强韧化设计。加入质量分数为0.2%、0.5%和1.0%的Al-TCB晶种合金后,A356铝合金的α-Al晶粒被显著细化,平均晶粒尺寸由1135μm分别细化至140、90和91μm;屈服强度分别提高了6.0%、10.0%和8.0%,抗拉强度分别提高了4.8%、8.1%和7.1%,伸长率也分别提高了40.7%、72.2%和77.8%。力学性能的提高主要归因于α-Al晶粒的细化以及其对共晶Si均匀化分布的改善。Strengthening and toughening design was conducted on the Al-7Si-0.35Mg(abbreviation for A356)alloy by using AI-TCB master alloy(TCB refers to the abbreviation of B-doped TiC and C-doped TiB_(2)particles).The chemical composition,microstructure and mechanical properties of the alloy were tested and analyzed by X-ray emission spectrometer,optical microscope,field-emission scanning electron microscope and universal testing machine,respectively.The results indicate that the Al-TCB master alloy exhibits excellent refinement ability with anti-Si"poisoning",and strengthening and toughening can be achieved by adjusting the amount of addition.After adding 0.2%,0.5%and 1.0%A1-TCB master alloy,theα-Al grains of A356 aluminum alloy are significantly refined,and the average grain size is reduced from 1135μm to 140μm,90μm and 91μm,respectively.The yield strength of A356 aluminum alloy is increased by 6.0%,10.0%and 8.0%,the tensile strength is increased by 4.8%,8.1%and 7.1%,and the elongation is also increased by 40.7%,72.2%and 77.8%,respectively.The enhancement of mechanical properties is mainly attributed to the refinement ofα-Al grains and homogenization distribution of eutectic Si.

关 键 词：Al-7Si-0.35Mg合金 Al-TCB晶种合金 晶粒细化 强韧化 

分 类 号：TG146.21[一般工业技术—材料科学与工程]