金属的塑性直接影响金属的加工使用性能,为了提高金属的塑性,增强金属的成形能力,材料工作者从材料的提纯、冶炼、锻压、热处理、强力成形等工艺技术方面,采取了很多措施,但都未能大幅度地提高金属的塑性。半个世纪以前,人们发现了金属的超塑性现象,而后进行了系统的理论和实用研究工作。到目前,人们把超塑性看成金属的一种重要属性。西方国家在五十年代开始逐步重视超塑 The plasticity of metal directly affects the processing and using properties of metal. In order to improve the plasticity of metal and enhance the forming ability of metal, material workers take many measures from the aspects of material purification, smelting, forging, heat treatment and forming. Have failed to significantly improve the plasticity of the metal. Half a century ago, people discovered the phenomenon of superplasticity of metals, and then conducted systematic theoretical and practical research. So far, people have seen superplasticity as an important property of metals. Western countries in the fifties began to gradually emphasis on super-plastic