Effect of Magnetic Field on Microstructure and Properties of Cu-15Ni-8Sn Alloy Prepared by Vertical Semi-Continuous Casting
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摘要: 通过在垂直半连续铸造过程中施加磁场与不施加磁场制备了两种不同晶粒尺寸的Cu-15Ni-8Sn合金棒材,并对两种合金棒材的微观组织和力学性能进行研究。微观组织分析结果表明,未施加磁场样品的微观组织中存在少量枝晶组织,而施加磁场样品的则完全为均匀细小的等轴晶;未施加磁场样品的平均晶粒尺寸为833.7 μm,施加磁场样品的平均晶粒尺寸为54.6 μm;施加磁场样品的Sn元素微观偏析有所改善,与未施加磁场样品的相比,富Sn相尺寸较小,且分布更加均匀。两种样品的铸态拉伸性能显示,施加磁场样品的抗拉强度、屈服强度、断后伸长率分别为465 MPa、290 MPa、15.4%;未施加磁场样品的抗拉强度、屈服强度、断后伸长率分别为429 MPa、242 MPa、23.9%。
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关键词:
- Cu-Ni-Sn合金 /
- 磁场 /
- 垂直半连续铸造 /
- 晶粒细化 /
- 微观偏析
Abstract: Two kinds of Cu-15Ni-8Sn alloy rods are prepared by vertical semi-continuous casting with and without magnetic field applied. The microstructures of the two alloy rods are observed, their grain sizes measured, their element distributions observed, and their mechanical properties tested. Results show that a small amount of dendrite structure is found in the microstructure of the sample without magnetic field, while the microstructure of the sample with magnetic field is composed of uniform and fine equiaxed crystal. The average grain size of the sample without magnetic field is 833.7 μm, and that of the sample with magnetic field is 54.6 μm. The microsegregation of Sn element in the sample with magnetic field is improved. Compared with the sample without magnetic field, the size of Sn-rich phase of the sample with magnetic field is smaller and the distribution is more uniform. The tensile strength, yield strength and percentage elongation after fracture of the sample with magnetic field are 465 MPa, 290 MPa and 15.4%, respectively. Those of the sample without magnetic field are 429 MPa, 242 MPa and 23.9%, respectively. -
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