任英磊
,
岳春雨
,
王廷沣
,
邱克强
,
李荣德
中国有色金属学报
采用单辊甩带法制备Mg71+xZn24-xCa5(x=0,2,4和6)合金条带,研究合金中Mg含量对条带非晶结构形成的影响、非晶条带对直蓝偶氮颜料废水的脱色降解能力和循环使用次数.结果表明:Mg71+xZn24-xCa5(x=0,2,4和6)合金在x≤4时,能形成厚度为20～25 μm的具有非晶结构的条带.非晶条带对直蓝溶液的降解速率和脱色率随Mg含量的提高而提高,其中Mg75Zn20Ca5非晶条带在2 min内使溶液澄清,以反映特征时间表示的降解速率仅为0.47 min,以吸光度所计算的脱色率达到95.41％.与废水反应60 min后的条带,其非晶结构基本不变,表面反应产物为矿化物质,不具备污染特征.Mg75Zn20Ca5非晶条带至少可以循环使用4次以上,而保持降解能力不低于80％.
关键词:
Mg-Zn-Ca
,
非晶条带
,
直蓝偶氮染料
,
降解能力
,
脱色率
,
循环使用
Jun Luo
,
Hong Yan
,
Nan Zheng
,
Rong-Shi Chen
金属学报(英文版)
doi:10.1007/s40195-016-0378-1
Four kinds of Mg alloys with different Zn and Ca concentration were selected to analyze the effect of Zn and Ca concentration on the microstructure and the mechanical properties of Mg-Zn-Ca alloys. It was found that Zn and Ca concentration has a great influence on the volume fraction, the morphology and the size of second phase. The Mg-1.95Zn-0.75Ca (wt%) alloy with the highest volume fraction, continuous network and largest size of Ca2Mg6Zn3 phase showed the lowest elongation to failure of about 7%, while the Mg-0.73Zn-0.12Ca (wt%) alloy with the lowest volume fraction and smallest size of Ca2Mg6Zn3 phase showed the highest elongation to failure of about 37%. It was suggested that uniform elongations of the Mg-Zn-Ca alloys were sensitive to the volume fraction of the Ca2Mg6Zn3 phases, especially the network Ca2Mg6Zn3 phases; post-uniform elongations were dependent on the size of the Ca2Mg6Zn3 phase, especially the size of network Ca2Mg6Zn3 phase. Reduction in Zn and Ca concentration was an effective way to improve the room-temperature ductility of weak textured Mg-Zn-Ca alloys.
关键词:
Mg-Zn-Ca
,
alloys
,
Ductility
,
Hot
,
rolling
,
Texture
,
Second
,
phase
