高速列车用中强可焊Al-Zn-Mg合金材料

Weld-able moderate strength Al-Zn-Mg alloy used for high speed train

中强可焊Al-Zn-Mg合金具有适中的强度、优良的焊接性能和良好的挤压工艺性能,是高速列车的主要材料之一。随着现代工业的快速发展,用户对该类合金材料的强度、韧性和抗应力腐蚀性能提出了更高的要求。本文简要介绍了国内外中强可焊Al-Zn-Mg合金的发展状况。论述了与进一步改善该类合金材料综合性能相关的技术内容,诸如优化合金成分,包括调整主合金元素含量、控制杂质含量和添加微量元素;研究热处理工艺,包括铸锭均匀化处理、加工材的固溶处理和时效处理工艺等技术内容。

The Al-Zn-Mg alloy possesses moderate strength,excellent weld ability and fine extrusion property.It is one of the main materials used for high speed train.Along with the high speed industry development the customers set a still higher demand on the strength,toughness and stress-corrosion resistance.The development situation of the weld-able moderate Al-Zn-Mg alloy both domestic and abroad has been introduced briefly.The technologies for improving the synthetic properties of the alloy,such as optimizing the alloy components,adjusting chemical contents,reducing inclusions and adding trace elements have been discussed.The thermal treatment technologies,for instance the billet homogenization,solid-heat treatment and aging process of the extrusions have been investigated.