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稀土Ce变质铸造Al-12.35Si合金的组织及性能
Microstructure and Properties of Rare Earth Ce Modified Cast Al-12.35Si Alloy
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- DOI:
- 作者:
- 解佩佩1史攀1李方峰2冯增建2李艳军2崔岩寿2刘志伟1
XIE Peipei 1 , SHI Pan 1 , LI Fangfeng 2 , FENG Zengjian 2 , LI Yanjun 2 , CUI Yanshou 2 , LIU Zhiwei 1
- 作者单位:
- 1. 西安交通大学金属材料强度国家重点实验室材料科学与工程学院 2. 滨州渤海活塞有限公司
1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi 'an Jiaotong University, Xi ’ an 710049, China. 2. Binzhou Bohai Piston Co., Ltd., Binzhou 256600, China
- 关键词:
- Ce;近共晶Al-Si合金;变质处理;微观组织;力学性能;
Ce; near eutectic Al-Si alloy; modification; microstructure; mechanical properties
- 摘要:
- 以添加Al-Ce稀土中间合金的方式对Al-12.35Si合金进行变质处理,研究Ce的添加量(0～0.8%)对合金微观组织和力学性能的影响规律。结果表明,添加适量的Ce可以减小共晶硅的尺寸,细化第二相,减小α-Al二次枝晶臂间距,提高合金的力学性能。但是当Ce的添加量超过0.2%时,会出现过变质现象,导致合金组织粗化,降低合金的力学性能。当Ce的添加量为0.2%时,Al-12.35Si合金的变质效果最为理想且得到了最优的力学性能,与未变质的Al-12.35Si合金相比,变质后,合金的抗拉强度从168 MPa提升到223 MPa,伸长率从0.44%提高到0.72%。
Al-12.35Si alloy was modified by adding Al-Ce rare earth master alloy. The effect of Ce content (0~ 0.8%) on
microstructure and mechanical properties of as-cast Al-12.35Si alloy was studied. The results show that adding appropriate
amount of Ce can reduce the size of eutectic silicon, refine the second phase, reduce the secondary dendrite arm spacing of
α-Al, and improve the mechanical properties of the alloy. However, when the addition of Ce is more than 0.2%, the
over-metamorphism will occur, which leads to the coarsening of the alloy microstructure and reduces the mechanical
properties of the alloy. When Ce content is 0.2% , the modification effect of Al-12.35Si alloy is ideal and the best
mechanical properties are obtained. Compared with the unmodified Al-12.35Si alloy, the tensile strength of the modified
alloy is increased from 168 MPa to 223 MPa, and the elongation is increased from 0.44% to 0.72%.