热处理对ARB制备6063Al/MB2多层结构复合材料组织和性能的影响

Influence of annealing on microstructure and mechanical properties of 6063Al/MB2 multi-layer structure cladding material produced by accumulative roll bonding

采用累积复合轧制技术制备6063Al/MB2多层结构复合材料,利用电子拉伸机、光学显微镜、扫描电镜研究了热处理对不同轧制道次6063Al/MB2多层结构复合材料的组织、性能和界面的影响。结果表明,ARB技术能够有效细化MB2层金属组织;试样在180℃热处理后,晶粒没有明显变化;320℃热处理后,晶粒明显长大;在220℃以下热处理,复合材料的抗拉强度比未经热处理态略有上升;在220℃以上热处理,抗拉强度随温度的升高而逐渐下降;在低温下退火,复合材料的剪切强度相比轧制后略有增加。随着温度的升高,扩散层厚度增加,有脆性金属间化合物生成,导致剪切强度下降。

Accumulative roll bonding（ ARB） was used to combine 6063 Al and MB2 Mg alloy sheets to produce an 6063 Al / MB2 cladding material sheet with multi-layer structure. The influence of annealing on micro-structure,mechanical properties and bonding interface of6063 Al / MB2 cladding material after different ARB passes was investigated by electronic tensile machine,OM and SEM. The results show that ARB technology can effectively refine the grain size of MB2 layer. After annealing at 180 ℃,the grain size of the sample is not obvious changed,but obvious grows above 320 ℃. Under annealing at 220 ℃,the tensile strength increases slightly than unannealed,but annealing above 220 ℃,the tensile strength decreases with annealing temperature increasing. Compared the samples of annealing and unannealed,the shear strength of the cladding material after annealing at low temperature increases slightly. With annealing temperature increasing,the thickness of diffusion layer increases,and the brittle inter-metallic created,and the shear strength of cladding material decreases.