超轻Mg-Li合金熔铸工艺与轧制温度的研究

The Melting and Casting Process and Rolling Temperatures for Ultralight Mg-4 16,8 2,10 8% wt% Li Alloys

采用电阻炉熔炼锂盐覆盖氩气保护的方法成功地熔炼和铸造了锂质量分数分别为４．１６ ％ ，８．２ ％ ，１０．８ 的超轻镁－ 锂合金铸锭，其组织分别为α，α＋ β和β固溶体。铸锭经均匀化后在２００ ℃，３００ ℃，４００ ℃轧制，研究了轧制温度，含锂量与轧制裂边的关系。实验发现α相合金在２００ ℃发生板材横裂碎化，３００ ～４００ ℃之间轧制裂边减轻，在４００ ℃最轻。β相合金在各温度下十分容易轧制。α＋ β相合金塑性较好，裂边介于α相和β相合金之间，在２００ ～３００ ℃塑性最好。

The ingots of ultralight Mg-4 16wt%(α phase),8.2%wt%(α+β phase),10.8 wt% Li(β phase) allots have been melted and cast successfully by means of lithium flux cover and argon protection in electric resisternce furnace The ingots,after they are homogenized,are rolled at 200℃,300℃,400℃respectively and the relationship of rolling temperature,lithium content with rolling dege cracks are investigate.It is found through experiment that α phase alloy cracks across the plate at 200 ℃ heavily,cracks less between 300～400℃ and the optimal deformation temperature are 400℃;βphase alloy can be rolled easily in various temperatures and α+β phase alloy has mediate plasticity with edge crack extent lying between α phase alloy and β phase alloy and better deformation termperatures lying between 200 ℃ and 300℃℃.