Nucleation potency prediction of LaB_6 with E2EM model and its influence on microstructure and tensile properties of Al-7Si-0.3Mg alloy  

使用E2EM模型预测LaB 6的形核潜力及其对Al-7Si-0.3Mg合金组织和拉伸性能的影响（英文）

作　　者：Li-jun JING Ye PAN Tao LU Jin-hong PI Teng-fei GU 景力军;潘冶;陆韬;皮锦红;顾腾飞(东南大学材料科学与工程学院先进金属材料实验室,南京211189;南京工程学院江苏先进结构材料和应用技术实验室,南京211167)

机构地区：[1]Jiangsu Key Laboratory of Advanced Metallic Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China [2]Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing Institute of Technology,Nanjing 211167,China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第9期1687-1694,共8页中国有色金属学报（英文版）

基　　金：Project(BM2007204)supported by Jiangsu Key Laboratory for Advanced Metallic Materials,China;Project(ASMA201501)supported by the Opening Project of Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,China

摘　　要：The edge-to-edge matching(E2EM)crystallographic model was used to predict the orientation relationships(ORs)between LaB6 and Al.Three different possible ORs can be predicted between LaB6 and Al,which are(100)Al||(100)LaB6,[001]Al||[001]LaB6;(110)Al||(110)LaB6,[001]Al||[001]LaB6;and(111)Al||(111)LaB6,[011]Al||[011]LaB6.The prediction results are perfectly confirmed through TEM analysis and prove the nucleation potency of LaB6.The refining efficacy of Al-2La-1B refiner and its influence on the tensile properties were investigated in the as-cast Al-7Si-0.3Mg alloy.According to the results,LaB6 has higher nucleation potency than TiB2,leading to better grain refining efficacy of Al-2La-1B refiner in the as-cast Al-7Si-0.3Mg alloy.Regarding the mechanical performances,tensile properties of the as-cast Al-7Si-0.3Mg casting alloy are prominently improved after addition of Al-2La-1B refiner,due to the refined microstructures.采用边-边匹配模型预测LaB6与Al之间的位向关系。预测结果显示LaB6与Al之间存在3种不同的位向关系,分别为(100)Al||(100)LaB 6,[001]Al||[001]LaB6;(110)Al|(110)LaB6,[001]Al||[001]LaB6和(111)Al||(111)LaB6,[011] Al||[011]LaB6。TEM分析结果完美地证明了模型的预测结果并证明了LaB6的形核潜力。研究Al-2La-B细化剂在Al-7Si-0.3Mg合金中的细化效率及其对合金性能的影响。根据结果可知,LaB6比TiB 2拥有更高的形核潜力,这使Al-2La-1B细化剂在Al-7Si-0.3Mg合金中表现出更好的细化效果。在合金性能方面,由于添加细化剂后的组织得到改善,Al-7Si-0.3Mg合金的拉伸性能显著提高。

关 键 词：edge-to-edge matching orientation relationship casting aluminum alloy grain refinement tensile properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG292[金属学及工艺—金属材料]