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近年来对于开发具有优良磁性能和高玻璃形成能力的新型铁基非晶合金的要求日益增长 ,相继开发了(Fe ,Co ,Ni) (Zr ,Hf ,Nb) B、Fe Si C B、Fe Nb B、Fe (Cr,Mo) (C ,B)、Fe Ga (P ,C ,B)系Fe基等一系列块体非晶合金。发现 (Fe , 相似文献
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用热分析法结合XRD、TEM研究了添加元素W、Nb对Fe76.5Cu1Si13.5B9非晶合金晶化行为的影响。结果表明,W或Nb的加入都降低了Fe-Cu-Si-B非晶合金反应的Avrami指数n;并且添加元素Nb更有利于该合金获得较小的a-Fe(Si)晶粒。 相似文献
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块体非晶态合金可以分为非铁基和铁基两大类 ,如下表所列 ,能制取非晶态最大直径 >5mm的非铁基(有色金属 )合金系有Mg Ln (Ni,Cu) ,Ln Al (Ni,Cu) ,Zr Al (Ni,Cu) ,含有Ti、Nb、Ta或Pd的Zr Al (Ni,Cu) ,还有Zr Ti Be Ni Cu、Pd Cu Ni P、Pd Cu Fe P、Ti Ni Cu Sn、Cu Zr Ti Y以及Cu Zr Ti Be系。另外 ,可形成非晶态最大直径 >2mm的铁基和钴基合金系 ,主要有Fe (Al,Ga) (P ,C ,B) ,含有Cr、Mo或Nb的Fe (Al,Ga) (P ,C … 相似文献
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Fe-Nb-R-B纳米晶和Fe-Zr-R-B合金的磁特性非晶合金通过热处理能获得以bcc-Fe相为主相的10~20nm左右微晶,这种Fe-(Zr,Nb)-B合金,具有1.5~1.7T高饱和磁感。这种材料和硬磁性纳米晶Fe-(Nd,Pr)-B合金复合,... 相似文献
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新型Fe-Co-Ni-Zr-Nb-B非晶合金日本东北大学材料研究所研究了新型Fe-Co-Ni-Zr-Nb-B系非晶合金的热稳定性和软磁性能。合金成分为Fe56Co7Ni7Zr10-xNbxB20(x=0~10)。由电弧炉熔炼母合金,用熔体快淬法制备厚... 相似文献
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大块非晶Fe┐Al┐Ga┐P┐C┐B┐Si合金的热稳定性和磁性近年来发现了一系列具有大玻璃形成能力的多元系非晶合金,如Mg-Ln-(Ni,Cu)、Ln-Al-TM、Zr-Al-TM、Zr-Ti-Al-TM、Zr-Ti-TM-Be、Pd-Cu-Ni-P... 相似文献
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反复熔炼对Zr基大块非晶合金玻璃形成能力的影响 总被引:3,自引:0,他引:3
研究了反复熔炼对Zr60Al15Ni25和Zr65Al7.5Ni10Cu17.5合金的玻璃形成能力的影响。DSC分析表明,随着熔炼次数的增多,Zr60Al15Ni25非晶合金的玻璃转变温度和晶化开始温度都提高,而Zr60Al7.5Ni10Cu17.5非晶合金的特征温度基本没有发生变化。Zr60Al15Ni25合金的熔化焓由于反复熔炼而降低,在热力学上有利于非晶相的形成。根据反复熔炼对铸锭凝固组织进而对合金熔体中的短程序的影响,讨论了玻璃形成能力的变化及原子间的结合力对短程序尺寸的影响,分析了2种合金对反复熔炼处理的敏感性的不同。 相似文献
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New Fe-based multicomponent amorphous alloys have been developed recently based on empirical rules for large glass forming ability(GFA).In the present investigation,the master alloy ingot with the nominal composition of Fe61Co7Zr10Mo5W2B15(mole fraction,%)was prepared by arc-melting under Ti-gettered Ar atmosphere. The Fe-based uttons with different transverse cross sections were fabricated by arc-melting method,and the d2.5mm Fe-based rods were manufactured by injection technique.Characterization of the ingots and the parameters associated with the thermal stability were carried out by X-ray diffractometry(XRD)and high temperature differential scanning calorimeter(DSC),respectively.The interval of the supercooled liquid region is 39K for the Fe-based alloy.The GFA of Fe-based alloys is relatively lower,to the buttons obtained are all crystallized.The Fe-based rod exhibites a high Vickers hardness up to HV 1329.In addition,and amorphous-crystalline transition layers are observed in the rod.This transition zone is caused by unhomogeneous temperature distribution and relatively lower GFA for Fe-based alloys. 相似文献
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利用铜模吸铸法制备(Fe0.5Co0.5)71-xNbxZr3Nd4B22(x=0~10)系块体合金,研究合金元素Nb的添加对该体系合金非晶形成能力(GFA)和磁性能的影响。结果表明,适当Nb的添加能有效提高合金的非晶形成能力。当Nb含量为5at%时,可获得具有完全非晶结构的块体非晶合金,该合金呈现典型的软磁性能,饱和磁化强度(Ms)为79 Am2/kg;合金的晶化温度(Tx)为957 K,晶化激活能E为538.30 kJ/mol。 相似文献
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采用“3D法”, 系统地研究了Ti-(Cu1-xNix)-Sn(0.20≤x≤0.30, 原子分数, 下同) 四元合金的玻璃 形成能力对成分变化的依赖性. 确定玻璃形成能力最佳的合金为Ti38Cu37.8Ni16.2Sn8,Cu模吸铸形成金属玻璃 棒材的临界直径接近1 mm.该金属玻璃的过冷液态温度区间宽度ΔTx为56 K, 约化玻璃转变温度T rg为0.57. 对电弧熔炼Ti38Cu37.8Ni16.2Sn8合金微观结构的研究表明,合金熔体的凝固主要经历伪二元共晶反应:L→ Ti5Sn3Cu+TiCuNi. 相似文献
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In the present paper, the influence of minor additions of Si, Pd and La with representative atomic sizes on glass forming ability (GFA) and thermal stability of Zr-Ni-based amorphous alloys has been investigated using X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and high resolution TEM (HRTEM). The results show that minor additions of La, Pd and Si can improve GFA of Zr-Ni-based alloys and La exhibits the optimum effect on enhancing GFA. The efficient cluster packing model can well explain the correlation between atomic sizes of additional elements and GFA of amorphous alloys. In addition, the relationship of the atomic size between the additional element and Zr has a more important effect on GFA than that between the additional element and Ni. The activation energy for crystallization of the Zr-Ni-based amorphous alloys with Si, Pd and La additions is obviously higher than that of the Zr66.7Ni33.3 amorphous alloy, and increases with decreasing distance between neighboring atoms. The thermal stability has a relation with topological short-range ordering of amorphous alloys. The proper addition of small atoms is preferential to enhance thermal stability of amorphous alloys due to stronger short-range ordering. Moreover, the small or intermediate atom addition can produce even better effect on thermal stability than the large atom addition. 相似文献
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Relationship between
phase composition and corrosion resistanceof Ni-Ti-Nb based shape memory alloys
1 INTRODUCTIONNi Ti Nballoys ,onaccountoftheirshapemem oryand phasetransformationhysterisis ,havebeenpaidattentionbyresearchersformanyyearsandpro posedforvariousapplications[1~ 5] .Theresultsshowthatthephasetransformationhysterisisdueto β NbparticlesinNi Timat… 相似文献
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采用结构分析和热分析手段研究了Nb对Zr65(Cu0.4Al0.3Ni0.3)35-xNbx(x=0, 3, 5, 6 7) (at%)合金玻璃形成能力和热稳定性的影响,采用铜模吸注法成功制备了非晶基体上均匀分布枝晶相的Zr65(Cu0.4Al0.3Ni0.3)28Nb7块体非晶复合材料.Nb的添加导致合金的过冷液相区间的宽度显著减小,同时,Nb的加入使得合金的原子结构更加无序化,因而合金具有更好的热稳定性. 相似文献
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Zr-Al-Co块状非晶的成分优化 总被引:2,自引:0,他引:2
运用等电子浓度和变电子浓度线判据实现了Zr—Al—Co块状非晶合金的成分优化.在(Al50Co50)-Zr等电子浓度线(e/α=1.5)和(Zr9Co4)—Al及(Zr78.5Co21.5)—Al变电子浓度线上设计成分,并通过吸铸法制备块状合金.实验结果表明,在(Al50Co50)—Zr等电子浓度线和(Zr9Co4)—Al变电子浓度线上可形成块状非晶合金,且非晶合金的热稳定性与非晶形成能力随电子浓度的增大而单调递增.其中,(Al50Co50)-Zr等电子浓度线和(Zr9Co4)—Al变电子浓度线交点处形成的Zr53Al23.5Co23.5非晶合金,具有最大的热稳定性和非晶形成能力,特征热力学参数Tg=783K,Tx=849K,Tg/Tm=0.637,Tg/Ti=0.590。 相似文献
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Zr55Al10Cu30Ni5-xPdx块状非晶合金的玻璃形成能力和热稳定性 总被引:2,自引:0,他引:2
用铜模铸造方法制备了不同尺寸的Zr55Al10Cu30Ni5-xPdx(x=0,1,3,5)块状非晶合金,采用X射线衍射(XRD)、扫描差热分析(DSC)和透射电镜(TEM)分别为Zr55Al10Cu30Ni5-xPdx块状非晶样品的结构、热稳定性和微观组织进行了研究。结果表明:x=1时,合金具有最高的过冷液相区(高达100K)及最大的热稳定性,而对合金的玻璃形成能力影响不大,这说明用适量的Pd代表Zr55Al10Cu30Ni5合金中的Ni会提高合金的热稳定性;x=3时,合金的热稳定性有所提高,但降低了合金的玻璃形成能力;x=5时,非晶合金的热稳定性和玻璃形成能力同时降低。 相似文献
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Mg86.33Ni13.67-xYx(x=0, 1, 3, 6, 10) amorphous alloys were obtained by single-roller melt-spinning technique and the effect of Y addition on the glass forming ability(GFA), crystallization and micro-hardness of Mg-Ni alloys were studied. The results show that the GFA of Mg86.33Ni13.67-xYx(x=0, 1, 3, 6, 10) is improved successfully with the Y addition. The highest GFA appeares at x=6, while the reduced glass transition temperature (Trg) is 0.5225 and the supercooled liquid region(ΔTx) is 42.06 K; the positio... 相似文献