729 Zr-Cu-Al 系バルクアモルファス合金の疲労挙動と Ni 添加による疲労強度の強化

概要

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In order to evaluate the effect of additive Ni element on fatigue strength, Wohler curves of Zr_<50>Cu_<40>Al_<10> and Zr_<50>Cu_<30>Ni_<10>Al_<10> bulk glassy alloys were examined with rotating-beam fatigue testing method. We also observed fatigue feature surfaces of Zr_<50>Cu_<40>Al_<10> and Zr_<50>Cu_<30>Ni_<10>Al_<10> bulk glassy alloys to estimate the fatigue fracture toughness, which might be decreased by thermal affect and oxygen embrittlement. Zr_<50>Cu_<40>Al_<10> bulk glassy alloy shows wide fatigue-fractured region with striation like mark up to 90% under the low applied stress (close to fatigue limit) condition. However, by adding Ni element, fatigue-fractured region is limited in half of whole fractured surface. As the result, fatigue limit is increased from 250MPa to 500MPa by adding 10at% Ni instead of Cu in Zr_<50>Cu_<40>Al_<10> bulk glassy alloy.
社団法人日本機械学会の論文
2002-10-10