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Fe替代Ni對鑄態(tài)及快淬態(tài)La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0-0.4)電極合金循環(huán)穩(wěn)定性的影響
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Influence of Substituting Ni with Fe on Cycle Stabilities of as-Cast and as-Quenched La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0-0.4) Electrode Alloys
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Supported by 863 Program (2006AA05Z132); Science and Technology Planned Project of Inner Mongolia, China (20050205) and Natural Science Foundation of Inner Mongolia, China (200711020703)

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    摘要:

    用鑄造及快淬工藝制備了La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0, 0.2, 0.3, 0.4)電極合金，研究了Fe替代Ni對合金循環(huán)穩(wěn)定性及微觀結構的影響。結果表明，F(xiàn)e替代Ni顯著地改善合金的循環(huán)穩(wěn)定性，且Fe替代Ni對快淬態(tài)合金的循環(huán)穩(wěn)定性具有更加顯著的作用。試驗合金具有多相結構，包括2個主相(La,Mg)Ni3和LaNi5以及1個殘余相LaNi2。Fe替代Ni促進快淬態(tài)合金形成類非晶結構，隨Fe含量的增加，快淬態(tài)合金的晶粒顯著細化，合金的晶格常數(shù)及晶胞體積顯著增大。

    Abstract:

    The electrode alloys La0.7Mg0.3Co0.45Ni2.55-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 results 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 LaNi5, and a residual phase LaNi2. The substitution of Fe for Ni helps the formation of a like amorphous structure in the as-quenched alloy. With the increase of Fe content, the grains in the as-quenched alloy are significantly refined, and the lattice constants and the cell volumes of the alloys are obviously enlarged.

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張羊換,李保衛(wèi),任慧平,吳忠旺,董小平,王新林. Fe替代Ni對鑄態(tài)及快淬態(tài)La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0-0.4)電極合金循環(huán)穩(wěn)定性的影響[J].稀有金屬材料與工程,2009,38(6):941~946.[Zhang Yanghuan, Li Baowei, Ren Huiping, Wu Zhongwang, Dong Xiaoping, Wang Xinlin. Influence of Substituting Ni with Fe on Cycle Stabilities of as-Cast and as-Quenched La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0-0.4) Electrode Alloys[J]. Rare Metal Materials and Engineering,2009,38(6):941~946.]
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  • 收稿日期:2008-06-25
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