Al-TCB对ZL205A合金晶粒细化及强韧化行为的影响  

Effect of Al-TCB on Grain Refinement and Mechanical Properties of ZL205A Alloy

作　　者：阎汐睿 韩梦霞 林翰 胡恺琪 刘桂亮 刘相法[1] YAN Xi-rui;HAN Meng-xia;LIN Han;HU Kai-qi;LIU Gui-liang;LIU Xiang-fa(Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan 250061,Shandong,China;Guizhou Aerospace Fenghua Precision Equipment,Guiyang 550000,Guizhou,China;Shandong Al&Mg Melt Technology Limited Company,Jinan 250061,Shandong,China)

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,山东济南250061 [2]贵州航天风华精密设备有限公司铸造工程中心,贵州贵阳550000 [3]山东吕美熔体技术有限公司,山东济南250061

出　　处：《铸造》2022年第11期1374-1381,共8页Foundry

基　　金：国家自然科学基金(52071189)。

摘　　要：采用含B掺杂TiC_(x)粒子的Al-TiCB晶种合金(Al-TCB)对含Zr的ZL205A合金进行了熔体处理,研究了该晶种合金对ZL205A合金微观组织及性能的影响。利用光学显微境、场发射扫描电镜、场发射电子探针等分别对Al-TCB晶种粒子特点及ZL205A合金的微观组织、流动性及力学性能进行了分析和测试。结果表明:加入0.5wt.%、1.0wt.%、2.0wt.%的Al-TCB后,ZL205A中α-Al晶粒得到明显细化,晶粒尺寸由236.8μm分别细化至77.7μm、75.5μm、69.2μm,晶粒细化效果稳定,抗Zr“中毒”能力强,且未发生明显的细化衰退现象;加入量为4.0wt.%左右即达到晶粒细化极限,此时晶粒尺寸为63.9μm,形貌由发达的树枝状转变为近球状。加入质量分数为1.0%的Al-TCB后,ZL205A合金的流动性明显提高,流动性试样的长度由457 mm增加至644 mm,流动性试样长度提升了40.9%;加入质量分数为1.0%的AlTCB后,合金的屈服强度、抗拉强度和伸长率分别为430 MPa、493 MPa和9.7%,分别提高了3.6%、3.1%和70.1%。Al-TiCB master alloy(Al-TCB),containing B doped TiCxparticles,was applied to ZL205A alloy containing Zr melt by casting process,and the effects of the Al-TiCB master alloys on the microstructures and properties of ZL205A alloy were studied.The phases of the Al-TCB master alloy,the microstructure,thefiuidity and mechanical properties of ZL205A alloys were analyzed and tested respectively by using of optical microscope,thermalfield scanning electron microscopy,electron probe micro-analysis methods.The results show that theα-Al grains in ZL205A are significantly refined,the average grain sizes are refined from 236.8μm to 77.7μm,75.5μm,69.2μm after adding 0.5wt.%,1.0wt.%,2.0wt.%Al-TCB,respectively.The grain refining effect is stable,the resistance to’Zr-poisoning’is strong,and there is no obvious phenomenon of refinement decline.Adding 4.0wt.%Al-TCB can reach the grain refinement limit,at this time the grain size is 63.9μm.The morphologies of theα-Al grains change from dendrite to nearly spherical.Moreover,thefiuidity of ZL205A melt is significantly improved after adding 1.0%of the Al-TCB,the length of thefiuidity sample is increased from 457 mm to 644 mm which is increased by 40.9%.The yield strength,tensile strength and elongation of ZL205A are 430 MPa,493 MPa and 9.7%after adding 1.0%of the Al-TCB,which are increased by 3.6%,3.1%and 70.1%respectively.

关 键 词：AL-CU合金 Al-TiCB晶种合金 晶粒细化 流动性 力学性能 

分 类 号：TG292[金属学及工艺—铸造]