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1.
采用单辊快淬法制备Fe40Co40Zr10-xNbxB10(x=0,2,4,6,8,10)合金薄带。利用X射线衍射仪(XRD)和扫描电镜(SEM)研究Fe40Co40Zr10-xNbxB10(x=0,2,4,6,8,10)合金的非晶形成能力和微观结构。结果表明:Nb含量的增加降低了合金的非晶形成能力。未添加Nb和添加Nb含量为2 at%、4 at%、6 at%时表面断裂时形貌比较复杂,为韧性断裂;当合金添加Nb含量为8at%、10at%时样品横断面的(SEM)表面比较光滑,为脆性断裂。  相似文献   

2.
为研究非晶合金在不同温度下结构的变化,研制了非晶合金拉应力流变测量实验装置。该装置主要由炉体、加热及温度控制系统和流变测量系统组成。将炉膛设计成对半打开的结构,加快了炉膛的散热、缩短了实验周期,测量连接杆选用导热系数和热膨胀系数均小的Invar合金,降低了测量连接杆对炉温影响,提高了测量精度。使用该装置,进行了Fe78Si9B13非晶合金条带拉应力流变测量实验,结合DSC实验结果,分析了Fe78Si9B13非晶合金条带的结构变化和流变性能。实验证明,该装置结构合理、简单实用,能较为准确地反映合金的流变变化。  相似文献   

3.
研究了Nd8Fe86B6合金在不同快淬速度下显微组织的变化.当快淬速度为12m/s时,快淬带的组织为纳米晶的Nd2Fe14B相和α-Fe相;当快淬速度增加到15m/s时,快淬带的组织为少量的α-Fe相和大量的非晶相;当快淬速度增加到18m/s时,快淬带的组织为完全非晶相.  相似文献   

4.
本文采用Miedema理论和几何模型相结合,通过用Miedema理论计算YCuMg合金中相应的二元合金的形成焓,采用几何模型预测了YCuMg三元合金液态和固态合金整个成分范围的形成焓。计算结果表明,MgYCu液态合金中随着cu含量的增加,合金形成焓数值增大,由于Cu的原子半径比Y和Mg要小,因此在固溶体中弹性能的贡献比较大。计算的液态形成焓与实验测量的结果符合得比较好,其符合的程度优于Zhang等人的模型。  相似文献   

5.
利用机械合金化方法得到了SiTi3非晶合金。经分析表明,SiTi3非晶合金是由于Si在Ti中的固溶量超过晶格稳定性限制,Ti的晶格发生“崩溃”而形成的,并对固溶量增加的原因进行了分析。  相似文献   

6.
大块非晶态合金   总被引:8,自引:0,他引:8  
回顾了非晶态合金的发展现状;从结构、热力学及动力学方面综述了大块非晶合金的形成原理;总结了性能特征及应用.  相似文献   

7.
采用单辊快凝直接制备和先制成非晶单相合金再经不同温度退火两种方法制备了高强度的Al87Ce3Ni8.5Mn1.5纳米非晶复合材料.用X光衍射(XRD)技术,透射电镜(TEM)和差示扫描量热(DSC)研究和比较了材料的形成条件、显微结构、α-Al晶粒尺寸、体积分数和显微硬度.后一种方法制备的复合材料结构更均匀,显微硬度更高,过程较容易控制.  相似文献   

8.
采用铜模吸铸法制备了块体ZrTiNiCuBe高熵非晶合金,研究了高熵非晶合金的结构、热稳定性及晶化动力学行为.研究结果表明,所制备的合金为单一非晶态,具有较强的玻璃形成能力与热稳定性,且玻璃转变与晶化均表现出明显的动力学效应.高熵非晶合金表现出过冷液相区窄、晶化区宽的迟滞缓慢晶化特性.该实验项目的综合性强,涉及材料设计...  相似文献   

9.
采用机械合金化方法制备了Al82Fe5Zr5Ce8非晶态合金,用扫描电镜、X射线衍射、差热分析等方法分析了非晶态合金Al82Fe5Zr5Ce8的形貌、结构、热稳定性。结果表明:Al82Fe5Zr5Ce8混合粉末经过机械合金化球磨200h后达到了非晶状态。热分析表明非晶态Al82Fe5Zr5Ce8合金的晶化分两阶段进行,在723K和783K经8h的退火后,非晶态Al82Fe5Zr5Ce8合金达到了完全晶化状态,该状态下出现了很多种中间化合物相,经不同温度退火后晶化产物相基本相同。利用Kissinger方程分析了两个晶化过程的晶化激活能,对应过程的晶化激活能分别是475.6 k J/mol和408.8 k J/mol。  相似文献   

10.
该文研究了采用机械合金化法制备Ni—Ti—Nb非晶态合金材料,用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对经不同机械合金化时间得到的Ni—Ti—Nb混合粉末进行了分析,结果表明Ni—Ti—Nb混合粉末球磨10h后可实现机械合金化。随着球磨持续进行,Ni、Ti、Nb合金粉末之间相互扩散,当扩散速度增加到一定程度,来不及形成有序结构,而形成Ni—Ti—Nb系非晶合金.  相似文献   

11.
1 Introduction Fe3Albasedalloysexhibithighoxidationresistance ,excellentsulphidationresistanceandlowcostofalloyconstituents.However ,thesealloyshavenot yetfoundwidespreadapplicationfortheirenvironmentalembrittlement[1~ 3] .Thetensilepropertiesandenvi ronment…  相似文献   

12.
以水热法制备的掺杂不同量稀土La的铁钴合金/钴铁氧体纳米复合物为前驱体,通过与三聚氰胺在高纯氮气氛中发生固相反应合成出掺杂稀土La的Fe-Co合金/石墨纳米复合物。XRD表征结果显示,La与Fe,Co形成了体心立方(bcc)结构的合金;由TEM,HRTEM观察出,掺杂La的Fe-Co合金纳米颗粒尺寸范围为200500nm,且被石墨层包覆;VSM室温磁性能测试结果说明,掺杂La的Fe-Co合金/石墨纳米复合物的饱和磁化强度随着La的掺杂量的增大先减小后增大,而矫顽力先增大后减小。  相似文献   

13.
1 Introduction FerichnanocrystallineFeZrBalloyssimultaneouslyshowgoodsoftmagneticpropertiesandlargesaturationmagnetization[1,2].Therearemainlytwophasesinthealloyswithoptimummagneticproperties:ananocrystallineαFephaseandanintergranularamorphousphas…  相似文献   

14.
Zr65Al10Ni10Cu15, Zr52.5Al10Ni10Cu15Be12.5 and Zr52.5Al10Ni14.6 Cu17.9Ti5bulk amorphous alloys were prepared by copper mould casting. The crystallization kinetics was measured by differential scanning calorimeter(DSC) with different heating rates, and the activation energy was calculated using Kissinger equation. The relationship between thermal stability and rate constant of crystallization reaction is discussed on the view of crystallization kinetics, and the effect of small atom Beryllium on thermal stability of bulk amorphous alloys is also studied.  相似文献   

15.
该文利用第一性原理计算对Mg60Cu30Y10合金进行了模拟研究,分析Mg60Cu30Y10合金的几何特征:双体关联函数、三体关联函数、空间关联系数,并利用Voronoi拼砌方法对Mg60Cu30Y10合金的结构做了分析.计算发现Mg60Cu30Y10合金中Mg原子的环境与晶态Mg2Cu中的环境类似,而Cu-Y、Y-Y之间的关联对于合金的性能起着决定性的作用.  相似文献   

16.
Zr65 Al10 Ni10 Cu15, Zr52.5 Al10 Ni10 Cu15 Be12.5 and Zr52.5 Al10 Ni14.6 Cu17.9 Ti5 bulk amorphous alloys were prepared by copper mould casting. The crystallization kinetics was measured by differential scanning calorimeter(DSC) with different heating rates, and the activation energy was calculated using Kissinger equation. The relationship between thermal stability and rate constant of crystallization reaction is discussed on the view of crystallization kinetics, and the effect of small atom Beryllium on thermal stability of bulk amorphous alloys is also studied.  相似文献   

17.
综述了目前对块体非晶态合金连接的研究现状.描述了采用液相连接方法,如爆炸焊、电子束焊、激光焊等实现同质、异质块体非晶合金以及块体非晶合金与晶态合金的连接.  相似文献   

18.
The mechanism involving the effect of disorder/order transformation on the environmental embrittlement in gaseous H2 is summarized. It is shown that there is no hydrogen embrittlement in disordered state of Kurnakov type intermetallics in gaseous H2. However, the H2-induced environmental embrittlement for the ordered alloy having identical chemical composition becomes severer as the degree of the order increases. The results of testing on the ion gage turned on and off during tensile testing show that the more sensitive to H2-induced hydrogen embrittlement for ordered alloy than disordered one is attributed to the fact that atomic ordering may accelerate the kinetics of the catalytic reaction to produce more atomic hydrogen. The results on simultaneous hydrogen charging show that disordered alloys embrittled as hydrogen atoms are forced into the material implying that the embrittlement of ordered alloy in gaseous H2 is also due to the acceleration of the kinetics of catalytic reaction. The above suggestion was further verified by the adsorption tests of Ni3Fe intermetallics powder. It is shown that the amount of chemically adsorbed hydrogen in ordered state is significantly larger than that adsorbed by the disordered alloy, indicating that the more sensitive to H2-induced embrittlement in the ordered state of alloy is essentially due to the accelerated catalytic reaction.  相似文献   

19.
本文讨论了铝基非晶合金的制备方法与力学性能.对当前铝基非晶合金的制备方法所取得了突破性进展进行了阐述.在前人文献基础上对部分铝基非晶合金的力学性能与常规铝合金进行分析比较,并对铝基非晶合金在装甲材料中的应用前景进行了展望.  相似文献   

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