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合金元素对铁基非晶GFA、热稳定性及磁性能的影响
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摘要
Fe基非晶合金作为一种新材料,由于具有优异的物理、化学、力学性能越来越受到人们广泛地重视。本文利用单辊旋淬和铜模喷铸法分别制备了铁基金属玻璃条带和块状非晶合金。在铁基合金中添加适量的合金元素C、Y、Sn、Co,通过X射线衍射(XRD)、差示扫描量热仪(DSC)和振动样品磁强计(VSM)分析方法,着重研究了添加元素对铁基金属玻璃的形成能力、热稳定性及磁性能的影响。
     研究工作表明:C元素的加入(小于等于7.75%)对合金的玻璃形成能力有贡献作用,随着C的加入,合金的熔点下降,ΔT_x、T_(rg)、γ都有不同程度的提高,说明合金的玻璃合金形成能力增强了。通过XRD分析,在原始成分(Fe_(68)Ni_1Al_5Ga_2P_(9.65)C_(6.75)B_(4.6)Si_3)中加入Y元素后,三种成分的合金都为非晶合金,通过DSC分析得知:第一晶化峰T_(p1)与第二晶化峰T_(p2)之间的差值随着Y的增加而减小。试验中发现随着Sn含量的增加,合金在淬态下的脆性逐渐提高。当Sn含量达到2.5%时,脆性最大。通过DSC检测发现,随着Sn含量的增加,晶化峰由两个逐渐变成一个。ΔT_x、T_(rg)、γ都随Sn含量的增加而提高,说明合金的非晶形成能力在逐渐增强。Co的加入有利于合金韧性的改善,当Co含量达到9(at%)时,合金具有最好的韧性,Co含量在0~5%范围内变化时,ΔT_x逐步减小,合金的熔点上升,γ值没有变化。而当Co含量在5%~9%范围内变化时,γ值逐渐上升,特别是在7%~9%范围内,γ值上升幅度最大。选择γ值较大的合金,采用铜模喷铸法成功制备出厚度为0.5mm的块体非晶,这也说明γ值作为评价合金GFA的参数具有一定的可信度。当Y含量在0.5%时,合金具有较好的软磁性能。饱和磁化强度和矫顽力随Co含量的变化不大。
As novel material, Fe-based amorphous alloys have attracted attention of people more and more, owing to its' excellent physical、chemical、mechanical performance.
     Fe-based amorphous ribbons and bulk amorphous alloys were prepared by spin quenching and copper mold casting respectively in this paper. Alloy elements, such as C、Y、Sn、Co, were added into Fe-based alloys with proper quantities, and the effect-s on glass-forming ability (GFA)、thermal stability and magnetic performance of Fe-based amorphous alloys were investigated by X-ray diffraction (XRD), differential scanning calorimeter (DSC) and vibrating sample magnetometer(VSM).
     Research work showed: addition of element C(less than or equal to 7.75%) was helpful to alloys' GFA, the melting point of alloy fell down accompany with addition of C,ΔT_x、T_(rg)、γincreased with different extent, which illustrated that GFA of alloys intensified. When element Y added into primitive component (Fe_(68)Ni_1Al_5Ga_2P_(9.65)C_(6.75)B_(4.6)Si_3), three kinds component of alloys were all amorphous alloys tested by X-ray diffraction (XRD), D-value between first crystallied peak T_(p1) and second crystallied peak T_(p2) decreased accompany with addition of Y analysed by differential scanning calorimeter (DSC). The brittleness of alloys enchanced gradually in cast condition with the increasement of Sn, when content of Sn reached 2.5% (at%), The brittleness of alloys got maximum.ΔT_x、T_(rg)、γenchanced with the increasement of content Sn, which denoted GFA of alloys intensified gradually. The addition of Co was favourable to improvement of alloys'toughness, when content of Co reached 9% (at%), alloys had best roughness, when content of Co varied between 0 and 5%,ΔT_x decreased gradually, melting point of alloys arised, parameterγhad no alteration. However, when content of Co changed between 5% and 9%, value ofγarised gradually, especially in 7%~9%,γhad maximal elevated amplitude. Among prepared amorphous thin strip, selected some alloys which had larger value ofγ, bulk amorphous alloys (0.5mm) were prepared successfully by copper mold casting, this also demonstrated that as parameter of appraised GFA, value ofγwas credible. Alloy had better Soft magnetism performance when content of Y reached 0.5%. Saturation magnetization and Coercive force had no obvious change along with change of Co.
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