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前言铝合金是近代工业中得到广泛应用的重要金属材料之一。铝合金具有比重小、比强度大、导电导热性好、耐腐蚀、可焊、无毒、光泽好以及低温性能良好等一系列优越性能。但是,在一般条件下,铝合金的塑性还满足不了复杂零件加工变形的要求,特别是变形硬化使加工更为困难。因此许多零件只能用棒料直接切削加工,材料利用率低,加工周期长,成本高。研究铝合金的超塑性及其成形技术,对提高材料利用率、节约工时、缩短生产周期、改善零件质量、降低生产成本具有重大意义。一般认为,铝合金超塑性的应用受到限制,主要原因在于塑性材料要求具有等轴、稳定
Preface Aluminum alloy is one of the important metal materials widely used in modern industry. Aluminum alloy with a small proportion of specific strength, good thermal conductivity, corrosion resistance, weldability, non-toxic, good gloss and low temperature performance and a series of superior performance. However, in general conditions, the plasticity of aluminum alloy can not meet the requirements of processing deformation of complex parts, especially the deformation hardening makes the processing more difficult. Therefore, many parts can only be directly cut with bar material, material utilization is low, the processing cycle is long, the cost is high. Studying the superplasticity of aluminum alloy and its forming technology is of great significance to improve material utilization, save man-hours, shorten the production cycle, improve the quality of parts and reduce the production cost. Generally believed that the application of superplasticity of aluminum is limited, the main reason is that plastic materials require equiaxed, stable