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超声振动和挤压压力作用下含0.6%Fe Al-Cu合金的 显微组织和力学性能
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华南理工大学,华南理工大学

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TG 214

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国家自然科学基金项目(面上项目) (51374110);广东省自然科学基金团队项目(2015A030312003),


Microstructure and mechanical properties of Al–Cu alloy with 0.6%Fe produced by ultrasonic vibration and applied pressure
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South China University of Technology,South China University of Technology

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    摘要:

    采用光学显微镜(OM)、扫描电子显微镜(SEM)和能谱(EDX)、图像统计以及拉伸试验等手段,研究超声振动(UT)和挤压压力(P)联合作用对铸态Al-5.0Cu-0.6Mn-0.6Fe合金显微组织和力学性能的影响。结果表明,P + UT工艺对处理和α-Al、富铁相和Al2Cu的形貌和尺寸有显著影响,富铁的金属间化合物,促进α-Al形貌由树枝状向球状转变,降低了α-AlAl6(FeMn)和Al2Cu相的尺寸。P + UT工艺有利于减少压力作用下经常出现的双峰组织和晶界偏析。P + UT工艺下得到最好的铸态力学性能:抗拉强度(UTS):268 MPa,屈服强度(YS):192 MPa,伸长率:17.1%,分别比重力铸造的合金高为64%、59%和307%。

    Abstract:

    The combined effect of ultrasonic vibration (UT) and applied pressure (P) on the microstructure and mechanical properties of the as-cast Al-5.0Cu-0.6Mn-0.6Fe alloy was investigated by using optical microscope (OM), scanning electron microscope (SEM) coupled with energy dispersive X-ray (EDX), image analysis as well as tensile test. The results showed that the P+UT processing has an siginificant effect on the morphology and size of α-Al, Fe-rich intermetallics, and Al2Cu, which promotes the morphology of α-Al transformation from dendritic to globular structure and significantly reduces the size of α-Fe, Al6(FeMn), and Al2Cu phase. The P+UT processing is helpful to reduce the degree of bimodal structure which usually occurrence under applied pressure and reduce the segregation along the grain boundary. The best as-cast tensile properties produced by the P+UT processing were ultimate tensile strength (UTS): 268 MPa, yield strength (YS): 192 MPa, and elongation: 17.1%, which were 64%, 59%, and 307% higher than those of the non-treated alloy, respectively.

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赵愈亮,张卫文.超声振动和挤压压力作用下含0.6%Fe Al-Cu合金的 显微组织和力学性能[J].稀有金属材料与工程,2018,47(2):457~462.[Zhao Yuliang, zhang Weiwen. Microstructure and mechanical properties of Al–Cu alloy with 0.6%Fe produced by ultrasonic vibration and applied pressure[J]. Rare Metal Materials and Engineering,2018,47(2):457~462.]
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  • 收稿日期:2016-03-08
  • 最后修改日期:2016-06-30
  • 录用日期:2016-07-15
  • 在线发布日期: 2018-03-15
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