摘要
采用原位生成法制备了Al-Nb-B中间合金,主要研究了Al-Nb-B中间合金的组织,以及Al-Nb-B中间合金对Al-12Si-4Cu-2Ni-1Mg合金的组织和室温拉伸性能的影响。结果表明,Al-Nb-B中间合金主要含有NbB2、Al3Nb两种颗粒。Al-Nb-B中间合金可以细化Al-12Si-4Cu-2Ni-1Mg合金中的α-Al晶粒,并减小二次枝晶间距,进而提高合金的室温拉伸性能。当Al-Nb-B中间合金添加量为2.5wt%时,α-Al晶粒平均尺寸为128.4μm,二次枝晶间距为11.67μm,相较于基体合金分别减小21.5%和32.3%。随着Al-Nb-B中间合金添加量的增加,Al-Si合金的抗拉强度呈逐渐上升的趋势,当Al-Nb-B中间合金添加量为2.5wt%时,Al-12Si-4Cu-2Ni-1Mg合金的抗拉强度为237 MPa,相较于基体合金增加10.7%。通过断口形貌分析可知,Al-Si合金断裂方式为脆性断裂,断裂机理为解理断裂。
The Al-Nb-B interalloy was prepared by the in-situ reaction method.The microstructure of Al-Nb-B inter-alloy was investigated and the influence of Al-Nb-B interalloy alloy on the microstructure and room temperature tensile properties of Al-12Si-4Cu-2Ni-1Mg alloy were studied.The results show that the NbB2and Al3Nb particles can be observed in Al-Nb-B interalloy alloy.The Al-Nb-B interalloy can refineα-Al grains and reduce the secondary dendrite arm spacing in Al-12Si-4Cu-2Ni-1Mg alloy,furthermore,the tensile property of the alloy is improved at room temperature.When the addition amount of Al-Nb-B interalloy is 2.5wt%,the average grain size ofα-Al is 128.4μm,and the secondary dendrite arm spacing is 11.67μm,which is decreased by 21.5%and 32.3%respectively compared with that of the matrix alloy.With the increase of the amount of Al-Nb-B interalloy,the tensile strength of Al-12Si-4Cu-2Ni-1Mg alloy shows a gradual increasing trend.When the amount of Al-Nb-B interalloy is 2.5wt%,the tensile strength of Al-12Si-4Cu-2Ni-1Mg alloy is 237MPa,which is increased by 10.7%compared with that of the matrix alloy.The fracture morphology analysis shows that the fracture of Al-12Si-4Cu-2Ni-1Mg alloy is brittle fracture and the fracture mechanism is cleavage fracture.
作者
毋启龙
郭永春
李建平
WU Qilong;GUO Yongchun;LI Jianping(School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China)
出处
《热加工工艺》
北大核心
2023年第5期36-40,45,共6页
Hot Working Technology
基金
中国北方发动机研究所项目(DLBF2018-KY-JS-066-J)
陕西省科学技术基金项目(2020JQ-808)
陕西省教育基金项目(19JK0400,19JK0402)
陕西省创新能力支撑计划项目(2017KCT-05)。
