Mg-Li alloy was called Ultra-Light Mg based alloy with density between 1.35g / m ~ 3 and 1.65g / m ~ 3 and it is the lightest and innocuity metal structural materials .

Mg-Li合金称为 超 轻镁 合金，密度一般为1.35～1.65g/m~3，是迄今为止最轻的无毒金属结构材料。

A new ultra-light material ( aluminum alloy ) and a new forming technology ( TWBs ) were reviewed .

为此，采用新型 超 轻材料（如铝 合金）和 采取新的成形工艺（拼焊板），对汽车的发展具有重要意义。