• Title/Summary/Keyword: Brazing Strip

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Microstructure and Mechanical Properties of Strip Casted Ag-27%Cu-25%Zn-3%Sn Brazing Alloy (브레이징용 Ag-27%Cu-25%Zn-3%Sn 박판 주조 스트립의 미세조직 및 기계적 특성 연구)

  • Kim, S.J.;Kim, M.C.;Lee, K.A.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.313-316
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    • 2008

  • This work sought to examine the suitability of twin roll strip casting for Ag-27%Cu-25%Zn-3%Sn brazing alloy (BAg-7A) and to investigate the mechanical properties and microstructure of the strip. The effect of aging heat treatment on the properties was also studied,. This new manufacturing process has applications in the production of the brazing alloy. XRD and microstructural analysis of the Ag-27%Cu-25%Zn-3%Sn strip represented eutectic microstructure of a Cu-rich phase and a Ag-rich matrix regardless of heat treatment. The results of mechanical tests showed tensile strength of 470MPa, a significant enhancement, and an 18% elongation of the twin roll casted strip, due mainly to the solid solution strengthening of Zn atoms (${\sim}20%$) in the Cu-rich phases. Tensile results showed gradually decreasing strengths and increasing elongation with aging heat treatment. Microstructural evolution and fractography were also investigated and related to the mechanical properties.

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Microstructure and Mechanical Properties of Ag-27.5%Cu-20.5%Zn-2.5%Mn-0.5%Ni Brazing Alloy Manufactured by Twin Roll Strip Casting (쌍롤 박판 주조법으로 제조한 Ag-27.5%Cu-20.5%Zn-2.5%Mn-0.5%Ni 브레이징 합금의 미세조직 및 기계적 특성)

  • Kim, Sung-Jun;Kang, Won-Guk;Kim, Mun-Chul;Kim, Yong-Chan;Lee, Kee-Ahn
    • Korean Journal of Metals and Materials
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    • v.47 no.10
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    • pp.605-612
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    • 2009

  • The suitability of twin roll strip casting for Ag-27.5%Cu-20.5%Zn-2.5%Mn-0.5%Ni brazing alloy (known as HS-49D) was examined in the present work and the mechanical properties and microstructure of the strip were also investigated. The effect of annealing heat treatment on the properties was also studied. The new manufacturing process has applications in the production of the brazing alloy. XRD and microstructural analyses of the Ag-27.5%Cu-20.5%Zn-2.5%Mn-0.5%Ni strip revealed a eutectic microstructure of an Ag-rich matrix (FCC) and a Cu-rich phase (FCC) regardless of heat treatment. The results of mechanical tests showed tensile strength of 434 MPa and 80% elongation for the twin roll casted strip. Tensile results showed decreasing strengths and increasing elongation with annealing heat treatment. Microstructural evolution and fractography were also investigated and related to the mechanical properties.

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