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鑄態(tài)和快淬態(tài)Mm(NiCoMnAl)_5B_x(x=0~0.2)貯氫合金的相結(jié)構(gòu)與電化學(xué)性能
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TG139.7

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國家自然科學(xué)基金重點項目(50131040)，國家自然科學(xué)基金項目(50071050)


Microstructure and Electrochemical Characteristics of Mm(NiCoMnAl)_5B_x(x=0~0.2) Hydrogen Storage Alloys Prepared by Casting and Rapidly Quenching
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    摘要:

    用鑄造及快淬工藝制備了低鈷AB5型Mm(NiCoMnAl)5Bx(x=0~0.2)貯氫合金,測試了合金的微觀結(jié)構(gòu)及電化學(xué)性能,研究了B含量及快淬工藝的變化對合金晶格常數(shù)、熱力學(xué)參數(shù)、微觀結(jié)構(gòu)及電化學(xué)性能的影響。結(jié)果表明:合金的晶格常數(shù)、晶胞體積及標(biāo)準(zhǔn)生成焓均隨B含量的增加而增大;在一定的淬速范圍內(nèi),快淬處理可以提高合金的放電容量,但淬速超過某一臨界淬速時,快淬合金的容量低于鑄態(tài)合金;合金的循環(huán)壽命隨淬速的增加而單調(diào)增加。

    Abstract:

    Low Co AB5-type Mm(NiCoMnAl)5Bx (x=0~0.2) hydrogen storage alloys were prepared by casting and rapidly quenching. The microstructures and electrochemical characteristics of the alloys were analyzed and measured. The effects of boron content and rapidly quenched technique on the lattice constants, thermodynamic parameters, microstructures and electrochemical properties of the alloys were investigated in detail. The obtained results show that the lattice constants, cell volume and standard enthalpy increased with the increase of boron content. When quenching rate is in a specifically range, the rapidly quenched treatment could enhance the discharge capacity of the alloys. When quenching rate is more than a certain critical value, The discharge capacity of the as-quenched alloy is less than that of the as-cast alloys. The cycle life of the alloys monotonously increased with the increase of quenching rate.

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王旭東,張羊換,陳梅艷,王國清,董小平,王新林.鑄態(tài)和快淬態(tài)Mm(NiCoMnAl)_5B_x(x=0~0.2)貯氫合金的相結(jié)構(gòu)與電化學(xué)性能[J].稀有金屬材料與工程,2005,34(5).[Wang Xudong, Zhang Yanghuan, Chen Meiyan, Wang Guoqing, Dong Xiaoping, Wang Xinlin. Microstructure and Electrochemical Characteristics of Mm(NiCoMnAl)_5B_x(x=0~0.2) Hydrogen Storage Alloys Prepared by Casting and Rapidly Quenching[J]. Rare Metal Materials and Engineering,2005,34(5).]
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