| Bi对Al-18%Si合金微观组织与力学性能的影响 |
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| 引用本文： | 兰晔峰,郭晶,李庆林,王强强.Bi对Al-18%Si合金微观组织与力学性能的影响[J].铸造,2011,60(5). |
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| 作者姓名： | 兰晔峰 郭晶 李庆林 王强强 |
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| 作者单位： | 1. 兰州理工大学材料科学与工程学院,甘肃,兰州,730050;兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃,兰州,730050
2. 兰州理工大学材料科学与工程学院,甘肃,兰州,730050 |
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| 摘 要： | 研究不同的Bi含量对过共晶Al-18%Si合金微观组织与力学性能的影响.试验表明,Al-18%Si-x%Bi(x=1,2,3,4,5)合金中,大部分Bi在基体中以小颗粒状弥散均匀分布,局部出现Bi的聚集;同时,Bi的加入对合金中的共晶硅起到一定的细化作用;随着Bi含量的增加,共晶硅组织由粗大针片状变成短杆状,当Bi含量达到3%时,共晶硅转变为均匀分布于基体的蠕点状,当Bi含量为4%或5%时,共晶硅没有进一步的细化.另外,力学性能和摩擦试验研究发现:Al-18%Si-3%Bi合金的抗拉强度由Al-18%Si合金的168 MPa提高为189 MPa,摩擦系数由0.4372降为0.3879,磨损量仅为不含Bi的20%.
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| 关 键 词： | 过共晶Al-18％Si合金 合金元素Bi 微观组织 力学性能 |
Effect of Bi on Microstructure and Mechanical Properties of Hyper-Eutectic Al-1 8%Si Alloy |
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| LAN Ye-feng,GUO Jing,LI Oing-lin,WANG Diang-qiang.Effect of Bi on Microstructure and Mechanical Properties of Hyper-Eutectic Al-1 8%Si Alloy[J].Foundry,2011,60(5). |
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| Authors: | LAN Ye-feng GUO Jing LI Oing-lin WANG Diang-qiang |
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| Affiliation: | LAN Ye-feng1,2,GUO Jing1,LI Qing-lin1,WANG Qiang-qiang1(1.School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China,2.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,China) |
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| Abstract: | Experiment was carried out to study the effect of different Bi content on microstructure and mechanical properties of hyper-eutectic Al-18%Si alloy.The results show that most of Bi distributed uniformly and dispersively in the Al-18%Si alloy matrix,only a little Bi aggregation was found;and Bi had a certain modification effect on eutectic Si,with the increasing of Bi content,eutectic silicon transformed from bulky needle-like to short stalk shape,and when addition of Bi reached 3%,eutectic silicon uniformly... |
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| Keywords: | hyper-eutectic Al-18%Si alloy alloying element Bi microstructure mechanical properties |
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