稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2009年
6期
941-946
,共6页
张羊换%李保卫%任慧平%吴忠旺%董小平%王新林
張羊換%李保衛%任慧平%吳忠旺%董小平%王新林
장양환%리보위%임혜평%오충왕%동소평%왕신림
La-Mg-Ni system electrode ahoy%substituting Ni with Fe%rapid quenching%cycle stability%structure
The electrode alloys La0.7,Mg0.3Co0.45Ni2.55-xFex (x = 0, 0.1, 0.2, 0.3, 0.4) were prepared by casting and rapid quenching. The influences of the substitution of Fe for Ni on their cycle stabilities as well as their structures were investigated in detail. The re-suits indicate that the substitution of Fe for Ni significantly improves the cycle stability of the alloys, and the positive impact of such a substitution on the cycle stability of the as-quenched alloy is much larger than that of the as-cast. All of the alloys have multiphase structures composed of two major phases, (La, Mg)Ni3 and LaNis, and a residual phase LaNi2. The substitution ofFe forNi helps the formation of a llke amorphous structure in the as-quenched alloy. With the increase of Fe content, the grains in the as-quenched ahoy are significantly refined, and the lattice constants and the cell volumes of the alloys are obviously enlarged.
