Design optimization of cast Cu-Al-Be-B alloys for high damping capacity

查看全文 作　　者：~*S. Lu~(1,2), W. H. Miao~1, J. Chen~1, P. H. Lin~2 (1. Department of Materials Engineering, East China Ship Building Institute of Technology, Zhenjiang 212003, Jiangsu, P. R. Chine;2. Department of Mechanical Engineering, Southeast University, Nonjing 210096, Jiangsu, P. R. Chine) 出　　处：《China Foundry》索引2004年第1卷第S1期,共6页 摘　　要：This paper investigated high-damping Cu-Al-Be-B cast alloys using metallographic analysis, X-ray diffraction (XRD) and electrical resistance measurements for transformation temperatures. The results showed that beryllium can stabilize β phase, resulting in a thermo-elastic martensite microstructure leading to high-damping capacity in cast Cu-Al-Be-B alloys. Trace additions of boron to Cu-Al-Be alloys can significantly refine the grains, providing high strength and ductility to the alloys. A factorial design of experiment method was used to optimize the composition and properties of cast Cu-Al-Be-B alloys. The optimal microstructure for thermo-elastic martensite can be obtained by adjusting the amounts of aluminum and beryllium to eutectoid or pseudo-eutectoid compositions. An optimized cast Cu-Al-Be-B alloy was developed to provide excellent mechanical properties, tensile strength σ_b=767MPa, elongation δ=7.62%, and damping capacity S. D. C=18.70%. 关 键 词：Cu-Al-Be-B ALLOYS DAMPING capacity mechanical property thermo-elastic MARTENSITE GRAIN REFINING shape memory alloys(SMA)