• Title/Summary/Keyword: heavy alloy

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Helical coil springs property in Cu-Zn-Al shape memory alloy (Cu-Zn-Al 형상기억합금의 코일스프링 특성)

  • Kwon, Hee-Kyung;Choi, Chang-Soo;Chung, In-Sang
    • Journal of the Korean Society for Heat Treatment
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    • v.9 no.3
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    • pp.187-197
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    • 1996

  • In this study, the properties of coil spring made by Cu-Zn-Al and B added shape memory alloys are investigated. The measurement of recovery displacement and energy with increasing weight, and thermocycling properties have been studied using displacement measuring device. Transformation temperature and phase change by thermocycling have been also investigated by DSC and X-ray diffractometer. Grain size of the alloy is refined from 1.2mm to $400{\mu}m$ by 0.06wt% of B addition. The maximum recovery energy of the coil spring for B added alloy is larger than that of no B added alloy, it is because of grain refinement. And shape memory ability of the coil spring by thermocycling decrease with increasing thermocycling after thermocycle under load. The degradation of shape memory properties of coil spring by thermocycling is improved by B addition.

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A Study on the Mechanical Characteristic in Al 6061 Alloys welded by Friction Stir Welding (Al 6061 합금의 마찰교반접합시 접합부의 역학적 특성에 관한 연구)

  • 방한서;김흥주;고민성;장웅성
    • Journal of Welding and Joining
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    • v.20 no.3
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    • pp.105-108
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    • 2002

  • Al-alloy is utilized widely as a light-weight material to an automobile, a vessel and many kind of equipment, due to the light-weight and its characteristics that is a good tensile strength, elongation and tenacity for bearing heavy load and weight. Al-alloy has the good property of hot working, cold working and corrosion-resistant. But the exiting fusion welding by using Al has some economical and technical problems, but on the other hand, Friction Stir Welding (FSW) that is new joining method can settle the disadvantages that occur to the fusion welding and Is being applied and extended into the various industry fields. On this study, To analyze accurately the mechanical properties of joining area by FSW in Al 6061 alloy by using finite analysis program with finite element method. The size of HAZ and the thermal distribution is simulated and the mechanical properties around the FSW joining area to the Al-alloy 6061 is examined.

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