排序方式: 共有66条查询结果,搜索用时 15 毫秒
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Ni50Mn27Ga23快淬薄带的马氏体相变和磁感生应变 总被引:2,自引:0,他引:2
采用快淬技术制各了非化学计量成分的Ni50Mn27Ga23多晶薄带,对快淬薄带的马氏体相变和磁感生应变进行了研究。结果表明,快淬薄带侄冷却和加热过程中仍然发牛热弹性马氏体相变及逆相变,具有典型的热弹性形状记忆效应,并且比铸态合金具有更大的应变,但是马氏体相变温度下降。快淬工艺在合金内部引入特定的内应力,使薄带形成织构,是合金获得更大相变应变和磁感卞应变的原因。热处理后,内应力大大降低,导致磁感牛应变降低。 相似文献
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Fe基非晶合金的恒导磁性能研究 总被引:1,自引:0,他引:1
研究了Fe基非晶合金在不同热处理工艺条件下的恒导磁性能.结果表明,通过简单的横向磁场热处理工艺,可将具有高饱和磁感应强度的Fe基非晶合金制成无间隙的恒导磁磁芯,并且具有良好的综合磁特性.合金在350℃处理时,恒磁范围达到400A/m,磁导率约为3.14×10-3T·m/A,随保温时间的延长,恒磁场范围提高到600A/m以上,但磁导率降低,约为1.25×10-3T@m/A.在晶化温度以下,提高横向磁场热处理温度有利于提高材料的恒导磁性能. 相似文献
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为了提高低钴AB5型贮氢合金的电化学循环稳定性,在低钴AB5型贮氢合金中加入微量的硼,用真空快淬工艺制备了稀土系低钴AB5型MmNi3.8Co0.4Mn0.6Al0.2Bx(x=0,0.1,0.2,0.3,0.4)贮氢合金,分析测试了铸态及快淬态合金的电化学性能及微观结构,研究了硼对铸态及快淬态合金微观结构及循环寿命的影响。结果表明,硼能大幅度提高铸态及快淬态低钴AB5型贮氢合金的电化学循环稳定性,但其作用机理是完全不同的。 相似文献
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In order to investigate the influences of the stoichiometric ratio ofB/A (A: gross A-site elements, B: gross B-site elements) and the substitution of Co for Ni on the structures and electrochemical performances of the AB3.5-4.1-type electrode alloys, the La-Mg-Ni-Co system La0.75Mg0.25Ni3.5Mx (M=Ni, Co; x= 0, 0.2, 0.4, 0.6) alloys were prepared by induction melting in a helium atmosphere. The structures and electrochemical performances of the alloys were systemically measured. The results show that the structures and electrochemical performances of the alloys are closely relevant to the B/A ratio. All the alloys exhibit a multiphase structure, including two major phases, (La, Mg)2Ni7 and LaNis, and a residual phase LaNi2, and with rising ratio B/A, the (La,Mg)2Ni7 phase decreases and the LaNi5 phase increases significantly. When ratio B/A-3.7, the alloys obtain the maximum discharge capacities. The high rate discharge(HRD) capability of the alloy (M=Ni) monotonously rises with growing B/A ratio, but that of the alloy (M=Co) first mounts up then declines. The cycle stability of the alloy (M-Co) monotonously increases with rising B/A ratio, but it first decreases slightly then increases for the alloy (M=Ni). The discharge potential of the alloy (M=Ni) declines with increasing B/A ratio (x〉0.2), but for the alloy (M-Co), the result is contrary. The substitution of Co for Ni significantly ameliorates the electrochemical performances. For a fixed ratio B/A=3.7, the Co substitution enhances the discharge capacity from 365.7 to 401.8 mA.h/g, the capacity retention ratio (S100) after 100 charging-discharging cycles from 50.32% to 53.26% and the HRD from 88.65% to 90.69%. 相似文献
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The La-Mg-Ni system A2B7-type electrode alloys with nominal composition La0.75-xZrxMg0.25Ni3.2Co0.2Al0.1(x=0,0.05, 0.1,0.15,0.2)were prepared by casting and melt-spinning.The influences of melt spinning on the electrochemical performances as well as the structures of the alloys were investigated.The results obtained by XRD,SEM and TEM show that the as-cast and spun alloys have a multiphase structure,consisting of two main phases(La,Mg)Ni3 and LaNi5 as well as a residual phase LaNi2.The melt spinning leads to an obvious increase of the LaNi5 phase and a decrease of the(La,Mg)Ni3 phase in the alloys.The results of the electrochemical measurement indicate that the discharge capacity of the alloys(x≤0.1)first increases and then decreases with the increase of spinning rate,whereas for x0.1,the discharge capacity of the alloys monotonously falls.The melt spinning slightly impairs the activation capability of the alloys,but it significantly enhances the cycle stability of the alloys. 相似文献
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快淬 TiZrVMnNi 贮氢合金的电化学性能研究 总被引:2,自引:0,他引:2
对比研究了熔体旋转和常规铸态Ti0 .8Zr0 .2 Mn0 .5V0 .5Ni1.0 贮氢合金的电化学特性。发现快淬态与铸态合金的活化性能都很好 ,经过 1~ 3次充放电循环 ,就可达到最大放电容量。快淬工艺明显提高了合金的放电容量 ,并且淬速与放电容量之间在一定情况下出现峰值。快淬工艺同时改善合金的放电电压特性 ,使合金的放电平台更平 ,平台电压更高。但是快淬钛基贮氢合金的循环稳定性能和铸态合金一样差 ,放电容量在 10次内急剧衰减。 相似文献
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The nanocrystalline and amorphous Mg2Ni-type electrode alloys with a composition of Mg20?xYxNi10 (x=0, 1, 2, 3 and 4) were fabricated by mechanical milling. Effects of Y content on the structures and e... 相似文献
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横向磁场热处理对高饱和磁感应强度Fe基非晶磁性能的影响 总被引:2,自引:1,他引:1
用真空感应炉在氩气保护下熔炼成母合金,再采用单辊快淬法制备成分为Fe63Co21Si2B14的非晶合金薄带,卷绕成铁芯后在不同温度下进行横向磁场热处理.研究了磁场热处理对合金磁性能的影响.结果表明,该Fe基非晶合金对磁场热处理非常敏感,通过简单的横向磁场热处理,合金可以获得良好的恒导磁性能,其Bs值可达1.73T.合金在360℃处理时,恒导磁范围达到240 A/m,恒磁导率约为2600,并且具有良好的综合磁特性.在晶化温度以下,提高热处理温度有利于提高材料的恒导磁性能. 相似文献