超高强度的纯铝材料研究  

Investigation on pure aluminum with super-high strength

作　　者：马跃新[1] 许晓嫦[2] 谭玉华[3] 

机构地区：[1]中山火炬职业技术学院,广东中山528436 [2]中南大学材料科学与工程学院,湖南长沙410083 [3]湘潭大学,湖南湘潭411105

出　　处：《轻合金加工技术》2011年第4期43-48,共6页Light Alloy Fabrication Technology

基　　金：2008年广东省中山市科技攻关项目;项目编号:20083A257

摘　　要：本试验利用超高速多向压缩(MAC)1060工业纯铝,以制造超高强度的纯铝材料。采用Gleeble-1500热模拟试验机和冲压机进行压缩,对压缩后的试样进行硬度、拉伸试验和显微组织观察。结果表明,提高应变速度,可以显著抑制动态回复,使纯铝平均晶粒达到0.39μm,大角晶界百分数为82.9%。当以60%的道次压缩量进行超高速深度压缩时试样产生裂纹。深入研究得出,获得大角晶界超细晶粒不一定需要在全过程中都采用大的道次应变量。当位错胞壁的位错密度接近饱和值后,降低道次压缩量,可以防止裂纹产生。当伸长率相近时,其拉伸强度比H12变形纯铝材提高1.86倍。因此,超高速多向压缩技术可以生产出超高强度的工业纯铝材料。The super-high strength pure aluminum has been prepared using 1060 commercial pure aluminum by Multi-Axial Compression（MAC） method at high speed.The compression was made by Gleeble 1500 thermal simulating device and punching press.The microstructure,hardness and tensile strength of the compressed samples have been investigated by optical microscope and transmission electron microscope.The results show that the dynamic recovery can be suppressed,the aluminum crystal sizes are 0.39 μm in average and the high angle grain boundary is 82% while the strain speed is being increased.The samples appear cracks at ultra-high speed compression with 60% reduction per pass.The investigation confirmed that to get the high angle grain boundary does not necessary using high pass reduction at the whole process.The cracks can be prevented when the dislocation density of the cell boundary is close to saturation value and the pass reduction being decreased.The tensile strength of the super-high strength pure aluminum is 1.86 times higher then that of commercial pure aluminum with H12 temper at similar elongation condition.There for the super-high strength pure aluminum products can be produce using ultra-high speed and Multi-Axial Compressing technologies.

关 键 词：工业纯铝材 强塑性变形 多向压缩 三向反复冲压强塑性变形 

分 类 号：TG146.21[一般工业技术—材料科学与工程]