| Understanding grain refining and anti Si-poisoning effect in Al-10Si/Al-5Nb-B system |
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| 作者姓名： | Yang Li Ying Jiang Bin Liu Qun Luo Bin Hu Qian Li |
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| 作者单位： | Materials Genome Institute, State Key Laboratory of Advanced Special Steels, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;China Science Lab, General Motors Global Research and Development, 56 Jinwan Road, Shanghai 201206, China |
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| 基金项目： | supported by the National Natural Science Foundation of China(51871138);Science and Technology Commission of Shanghai Municipality(19010500400);the 111 project(No.D16002)。 |
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| 摘 要： | Grain refinement is critical for fabricating high-quality Al-Si casting components in the application of automobile and aerospace industries,while the well-known Si-poisoning effect makes it difficult.Nbbased refiners offer an effective method to refine Al-Si casting alloys,but their anti Si-poisoning capability is far from being understood.In this work,the grain refining mechanism and the anti Si-poisoning effect in the Al-10 Si/Al-5 Nb-B system were systematically investigated by combining transmission electron microscope,first-principles calculations,and thermodynamic calculations.It is revealed that NbB2provides the main nucleation site in the Al-10 Si ingot inoculated by 0.1 wt.%Nb Al-5 Nb-B refiner.The exposed Nb atoms on the(0001)NbB2and(1-100)NbB2surface can be substituted by Al to form(Al,Nb)B2intermedia layers.In addition,a layer of NbAl3-like compound(NbAl3')can cover the surface of NbB2with the orientation relation of(1-100)11-20]NbB2//(110)110]NbAl3'.Both of the(Al,Nb)B2and NbAl3'intermedia layers contribute to enhancing the nucleation potency of NbB2particles.These discoveries provide fundamental insight to the grain refining mechanism of the Nb-B based refiners for Al-Si casting alloys and are expected to guide the future development of stronger refiners for Al-Si casting alloys.
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| 关 键 词： | Al-Si casting alloys Grain refinement Niobium diboride Interface Anti Si-poisoning |
Understanding grain refining and anti Si-poisoning effect in Al-10Si/Al-5Nb-B system |
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| Yang Li,Ying Jiang,Bin Liu,Qun Luo,Bin Hu,Qian Li.Understanding grain refining and anti Si-poisoning effect in Al-10Si/Al-5Nb-B system[J].Journal of Materials Science & Technology,2021,65(6):190-201. |
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| Authors: | Yang Li Ying Jiang Bin Liu Qun Luo Bin Hu Qian Li |
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| Abstract: | Grain refinement is critical for fabricating high-quality Al-Si casting components in the application of automobile and aerospace industries,while the well-known Si-poisoning effect makes it difficult.Nbbased refiners offer an effective method to refine Al-Si casting alloys,but their anti Si-poisoning capability is far from being understood.In this work,the grain refining mechanism and the anti Si-poisoning effect in the Al-10 Si/Al-5 Nb-B system were systematically investigated by combining transmission electron microscope,first-principles calculations,and thermodynamic calculations.It is revealed that NbB_2 provides the main nucleation site in the Al-10 Si ingot inoculated by 0.1 wt.%Nb Al-5 Nb-B refiner.The exposed Nb atoms on the(0 0 0 1) NbB_2 and(1-100) NbB_2 surface can be substituted by Al to form(Al,Nb)B_2 intermedia layers.In addition,a layer of NbAl_3-like compound(NbAl_3 ') can cover the surface of NbB_2 with the orientation relation of(1-100)1 1-2 0] NbB_(2/)/(110)110]NbAl_3 '.Both of the(Al,Nb)B_2 and NbAl_3'intermedia layers contribute to enhancing the nucleation potency of NbB_2 particles.These discoveries provide fundamental insight to the grain refining mechanism of the Nb-B based refiners for Al-Si casting alloys and are expected to guide the future development of stronger refiners for Al-Si casting alloys. |
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| Keywords: | Al-Si casting alloys Grain refinement Niobium diboride Interface Anti Si-poisoning |
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