Zr-Al-Ni-Cu大块非晶合金的变温晶化行为研究

研究了Zr-Al-Ni-Cu大块非晶合金在连续升温过程中的晶化行为。结果表明,随升温速度的加快,特征温度Tg,Tx,Tp均向高温区移动,晶化热焓增加,过冷温度区间扩大,并且峰值温度Tp对应的晶化体积分数减少。利用Kissinger曲线和Doyle曲线法计算合金的变温晶化激活能E,结果表明,晶化激活能随晶化过程的进行,其值先增加后降低,并且在晶化即将结束时,晶化激活能急剧降低。采用Kissinger曲线计算晶化激活能,由于特征温度在不同的加热速度下对应的晶化体积分数发生变化,从而导致了激活能计算值的偏大。

激光熔覆Zr-Al-Ni-Cu复合涂层组织及其摩擦磨损性能

采用激光熔覆技术在 Ti基体上制备了 Zr65Al7.5Ni1 0 Cu1 7.5合金涂层 ,涂层由金属间化合物、少量非晶和纳米晶构成 .分别向涂层中添加 C或 B及 Si等组元 ,使涂层硬度由原来的 10 41H K升高到 10 85 H K和 12 5 2 H K;同时在干摩擦条件下考察了其摩擦磨损行为 .结果表明 ,涂层的摩擦系数分别为 0 .14、0 .16和 0 .17,涂层磨损机制以磨粒磨损。

淬态晶相对块状Zr-Al-Ni-Cu非晶合金疲劳断裂的影响

研究了带有淬态晶相块体非晶合金的对称循环疲劳断裂.结果表明,粗大的晶相促进疲劳裂纹的萌生,而完全非晶试样及带有细小晶相试样的裂纹萌生于样品的表层.非晶基体断口为典型的非晶疲劳条纹,在晶相处为典型的瞬断断口形貌.非晶基体疲劳条纹的间距远大于晶体疲劳条纹的间距.

吸铸法制备Zr-Al-Ni-Cu-Mo大块非晶合金

采用吸铸方法制备了 Zr6 0 Al9Ni1 5Cu1 5Mo1 五元合金 ,利用 X射线、光学显微镜和差示扫描量热法研究了其结构和热稳定性。实验结果表明 ,该合金组织从宏观上看 ,几乎均由非晶相组成 ,其玻璃转变温度 Tg、晶化温度 Tx 值分别为 6 88和 773K,过冷液相区宽度 ΔTx 值为 85 K,表明了一个具有大的玻璃形成能力的五元非晶合金的形成 ,但与四元 Zr- Al- Ni- Cu合金系相比 。

Zr-Al-Ni-Cu大块非晶合金的电化学腐蚀行为研究

用电化学方法研究了 6种不同成分的大块非晶合金、与非晶成分相对应的两种晶态合金和纯Zr在 0 .1mol/LNa2 SO4 溶液中的腐蚀行为 ,结果表明 ,6种非晶样品中 ,有 4种具有高耐蚀性能 ,其中 ,成分为Zr65Al7.5Ni10 Cu17.5的样品具有最低的icorr值 1.38× 10 - 2 μA·cm- 2 。两种具有相同成分的非晶与晶态合金相比 ,晶态合金具有更低的icorr值。在 9种实验样品中纯Zr具有最低的icorr值 7.10× 10 - 3 μA·cm- 2 。

Zr-Al-Ni-Cu-Nb块体非晶复合材料的制备及热稳定性(英文)

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。

Zr-Al-Ni-Cu glass forming alloys with low fragility parameters

Zr-Al-Ni-Cu bulk metallic glasses （BMGs） were developed and their fragility parameters （m） were calculated by Arrhenius and Vogel-Fulcher-Tammann （VFT） equations. The results show that the m values of the Zr-Al-Ni-Cu BMGs derived by Arrhenius equation are in agreement with the corresponding m values derived by VFT equation. These Zr-Al-Ni-Cu BMGs characterize in low m values. The low m values for these BMGs would be due to their network microstructures. In addition, the m values of Zr-Al-Cu-Ni BMGs could be obtained by regulating Zr content. The composition of Zr-Al-Cu-Ni BMGs with the lowest m value would be near 54%Zr （mole fraction） because the m value about 13 of Zr 54 Al 13 Cu 18 Ni 15 BMG is the lowest among these Zr-Al-Ni-Cu BMGs developed.

Corrosion resistance of Zr-Al-Ni-Cu(Nb) bulk amorphous alloys

The corrosion resistance of Zr-Al-Ni-Cu(Nb) bulk amorphous alloys was systematically investigated. The experimental results show that the corrosion resistance of Zr-based bulk amorphous alloys can not be considered to be excellent at any situation, whereas it is affected by many factors such as the kind of corrosive medium, solution concentration and the alloy composition. It is found that Zr-Al-Ni-Cu bulk amorphous alloys are seriously corroded in HCl solution in comparison with their excellent corrosion resistance at other acid, alkali and salt circumstances for passivating. Its resistance ability against the chlorine ion induced pitting corrosion can be greatly improved by the addition of Nb element.

Effects of small amount Ta on the characteristics of the Zr-Al-Ni-Cu-Ta bulk metallic glass

The effects of Ta on the characteristics of the Zr-base BMG (bulk metallic glass) were investigated. Zr55Al10Ni5Cu30-xTax (x=1, 2,4) bulk metallic glasses (BMGs) with 3.5 mm diameter and 70 mm length were successfully prepared by using combined jet and copper mold casting. A small amount of Ta addition does not change the glass transition temperature, crystallization temperature, and supercooled liquid region obviously, but Ta promotes composition separation and two-stage crystallization. The stable crystalline phases include Zr2Ni, CuZr2, Al2Zr3 intermetallic compounds and Ta-rich solid solution after annealing the Zr-Al-Ni-Cu-Ta alloys at 753 K. Zr55Al10Ni5Cu30-xTax (x=1,2,4) bulk glassy alloys exhibit a better compressive strength. The stress-strain curve shows a zigzag feature, and the fracture surface shows intersecting of shear bands. It may correlate with the inhomogeneous feature of amorphous structure.

Zr-Al-Ni-Cu非晶合金F-A_(2)B型晶化相析出形为

基于EET(Empirical Electron Theory of Solids and Molecules)理论计算了Zr-Al-Ni-Cu非晶合金晶化初期可能析出的面心立方F-A_(2)B型晶化相的价电子结构,用最强键键合力n_(1)和结构单元总成键能力F分析了晶化相结构的稳定性。采用铜模吸铸法制备了Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金,使用差示扫描量热分析法和X射线衍射法研究了Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金的晶化过程及析出的晶化相。研究表明,Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金在763 K等温退火,晶化初期形成了F-Zr_(2)Ni晶化相。F-Zr_(2)Ni最强共价键的n_(1)值分别比F-Zr_(2)Al、F-Zr_(2)Cu的高85.76%、29.59%,F-Zr_(2)Ni的总成键能力F分别比F-Zr_(2)Al、F-Zr_(2)Cu的高98.99%、9.96%;从晶化相的稳定性及其组成原子间最强键键合力看,Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金晶化初期只能形成F-Zr_(2)Ni晶化相。Zr-Al-Ni-Cu非晶合金晶化初期晶化相类型取决于合金成分和晶化相稳定性及其组成原子间的键合力。

Mechanism,condition and characteristics for the formation of the network structure in Zr-Al-Ni-Cu bulk metallic glasses

Mechanism,condition and characteristics for the formation of the network structure in a group of Zr-Al-Ni-Cu bulk metallic glasses(BMGs) were investigated.The results show that the constituent segregation and/or the symplastic growth would be the mechanisms for the formation of the cell structure in the present Zr-Al-Ni-Cu BMGs.The cell structure can be easily obtained for the glass forming alloys whose compositions locate nearby the eutectic point.The shorter the distance is from the eutectic point,the larger the cell and the thicker the cell wall of the network structure will be.The present investigation would provide useful information for the development of the BMG with the network structure.

非晶合金Zr_(55)Al_(10)Cu_(30)Ni_5在3.5%NaCl溶液中的电化学行为

利用电化学极化曲线方法和电化学阻抗（EIS）技术研究了非晶合金Zr55Al10Cu30Ni5在3.5％NaCl溶液中的电化学行为.极化曲线测试结果表明,非晶合金Zr55Al10Cu30Ni5在3.5％NaCl溶液中具有很好的耐蚀性能,阳极过程表现出钝化的特征,当极化电位很高时,非晶合金出现了点腐蚀.电化学交流阻抗测试表明,在阴极极化、开路电位和钝化电位下,非晶合金的Nyquist图由单容抗弧构成,具有很高的电荷转移电阻,表现出优良的耐蚀性,在点蚀电位附近和点蚀电位区EIS分别有两个时间常数和三个时间常数.非晶合金在3.5％NaCl溶液中浸泡12h后,耐蚀性能有所下降.

Zr_(55)Al_(10)Cu_(30)Ni_(5-x)Pd_x块状非晶合金的玻璃形成能力和热稳定性

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)分别对Zr55A110Cu30Ni5-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100 K)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代替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.

升温速度对Zr65Ni10Cu17．5Al7．5块体非晶合金晶化的影响

采用差示扫描量热法(DSC)研究了不同加热速率下Zr65Ni10Cu17.5Al7.5块体非晶合金从玻璃转变到熔融温度区间中的晶化过程。结果显示,在升温过程中该非晶合金的晶化过程存在3个阶段,每个阶段对应的晶化起始温度和晶化峰值温度都随升温速度的升高而向高温区域移动,并用JMA理论和热分析动力学进行分析。通过淬火并结合XRD分析,发现随着温度升高,对应这3个阶段的合金相是由准晶相经四方晶系的Al2Zr3和NiZr2混合相向四方晶系的CuZr2、立方晶系的NiZr2以及斜方晶系的Al3Zr2的混合相进行晶化转变,并且每个阶段的晶化产物和晶粒尺寸随升温速度的提高变化不大。并发现高升温速度下第二阶段的晶化对第一阶段有抑制作用。

真空度对Zr-Al-Cu-Ni合金大块玻璃形成的影响

在两种不同的真空度下 ,运用真空电弧炉熔炼合金制备试样 ;运用X射线衍射技术和晶相显微技术对试样进行了分析和讨论。结果表明 :用真空电弧炉熔炼合金能得到比较均匀的母合金熔体 ;由于Zr Al Cu Ni合金与铜型之间的润湿角很大 ,因而形成玻璃能力强 ;高真空度、原材料成分的纯度是Zr Al Cu Ni合金形成玻璃态的重要因素 ;金属合金熔体随水冷铜型一起冷却 ,在真空度不高的条件下 ,由于合金熔体中的组元与空气中的氧、氢及氮反应形成晶核 ,而合金熔体与铜型之间的温度梯度不大 ,无法抑制晶核的生长 。

锆基非晶合金专利技术综述

非晶合金是一种长程无序结构的金属材料,具有优异的力学、化学、电学、磁学性能。本文以锆基非晶合金为研究对象,重点挖掘全球范围内的专利申请信息、技术发展脉络等内容,以期掌握锆基非晶合金的发展状况及研究热点,为国内非晶合金的研发及专利布局提供借鉴。

激光功率对Zr基非晶复合涂层微观组织与耐腐蚀性能的影响

选取单质混合粉末,在纯Zr基板上利用激光熔覆技术制备了Zr-Cu-Ni-Al非晶涂层。采用X射线衍射分析仪(XRD)、扫描电镜(SEM)、显微硬度仪及电化学工作站研究了激光功率对熔覆层显微组织与性能的影响。结果表明:熔覆涂层由非晶相、金属间化合物及部分金属氧化物等共同组成,熔覆涂层树枝晶尺寸随着激光功率的增加而增大,熔覆涂层的硬度随着树枝晶尺寸增大而降低,涂层硬度最高可达(567.1±12.3)HV0.5,是基体硬度的4.2倍;当激光功率为1000 W,扫描速率为800 mm/min时,涂层的耐蚀性能最好,其中自腐蚀电位为-0.182 V,电流密度为5.2×10^-8 A/cm^2。

Al含量对Zr-Cu-Ni-Al合金力学性能的影响

借助X-射线衍射仪、数字显微硬度计、扫描电镜和万能材料试验机等设备研究了Al含量变化对Zr合金力学性能的影响。结果表明,随着Al含量的增加,合金组织中的晶粒变小,合金硬度,压缩强度增加;当Al原子含量达到10%时,合金的硬度,强度都最佳;随着Al含量的进一步升高,合金力学性能下降。

Experimental Investigation on Microstructure and Segregation of Ultrahigh Strength Al-Zn-Mg-Cu-Zr-Sc-Ni Alloy during Homogenization

Ultrahigh strength Al-12Zn-2.4Mg-1.1Cu-0.20Zr-0.30Sc-0.30Ni alloy billets were fabricated by spray deposition method(the Osprey process). The effect of homogenization treatment on the microstructures and tensile properties were investigated by OM, SEM and EDS. The results show that adding small amount of Sc and Zr can greatly refine the grain size of the billet, with the average grain size of 10 μm. Grain-boundary becomes coarser firstly and then thinner under different homogenizing condition and grain coarsening were observed. The solute elements content of Zn inside grains has a peak at 490 ℃ /2 h, and Cu element, which was solved into matrix, can enhance the matrix hardness obviously during homogenization. The suitable homogenizing treatment is 460～490 °C/2 h for the hot extrusion of the studied alloy; after the optimized solid solution and T6 aging, the highest ultimate tensile strength (UTS) is 858 MPa with a ductility of 4.8%.