Bulk glass formation in ternary Cu-Zr-Ti system

The formation of bulk metallic glasses (BMGs) in ternary Cu-Zr-Ti system was investigated by a copper mold casting method. The nature of the amorphous phase was verified by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was demonstrated that the BMGs could be formed in a broad composition range in this system. Cu50Zr42.5Ti7.5, Cu60Zr27.5Ti12.5, Cu60Zr30Ti10 and Cu60Zr32.5Ti7.5 alloys exhibit strong glass-forming ability (GFA), and fully glassy rods of 5 mm in diameter can be obtained. In the center region of the ternary diagram, however, the GFA of the alloys was degraded due to the presence of Laves phase. The degradation of the GFA results from easy nucleation of the Laves phase in the undercooled liquid.     

退火处理对Ti-Zr-Cu-Be块体非晶合金力学性能的影响

采用铜模铸造法制备了直径为2mm的Ti55-xZr10+xBe27.5Cu7.5(x=0,10,20)块体非晶合金,并对其进行等温退火处理.利用X射线衍射(XRD)、扫描电镜(SEM)、差氏扫描量热仪(DSC)及压缩试验等方法研究了非晶合金的相结构、显微组织和热稳定性,以及退火处理对其力学性能的影响.结果表明:该系列合金在553 K及583 K下保温长达5 h时间内依然表现为非晶态.退火处理后,Ti35Zr30Be27.5Cu7.5合金屈服强度、断裂强度均提到了提高,其中在583 K下保温1 h后屈服强度、断裂强度分别达到了1 921、2 169 MPa;其塑性由处理前的3.47%提高到了6.57%.Ti45Zr20Be27.5Cu7.5合金在退火后其力学性能变化不明显.Ti55Zr10Be27.5Cu7.5合金随着退火温度及保温时间的增加其屈服强度、断裂强度及塑性均明显降低.     

Ti-Cu-Ni-Zr块体非晶合金形成能力及其压缩性能

采用铜模铸造法制备了不同直径的Ti40Cu34+xNi16-xZr10(x=0,2,4,5,6)系列合金,并利用X射线衍射(XRD)、扫描电镜(SEM)、差氏扫描量热仪(DSC)研究了合金的相结构、显微组织、热稳定性.结果表明:只有Ti40Cu39Ni11Zr10合金成分可制备出2 mm的全非晶结构,增加制备尺寸到3 mm、4 mm后,有TiCu晶体相析出;玻璃转变温度Tg、晶化温度Tx分别为665 K和712 K,过冷液相区ΔTx为47K.压缩实验表明:Ti40Cu39Ni11Zr10块体非晶合金具有高达1 931 MPa的屈服强度,并伴有0.3%左右微量压缩变形量,塑性变形以锯齿形式出现;Ti40Cu34Ni16Zr10合金具有1.3%的压缩变形量,TiCu相的析出提高了该合金压缩变形量.     

Bulk metallic glass rings prepared by a modified water quenching method

Bulk metallic glass rings have the potential applications as annular gasket and active solder in special fields.The bulk me-tallic glass ring of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 with the outer diameter,the inner diameter,and the thickness of 38,36,and 5 mm,re-spectively,was prepared by using a special shaped quartz tube water quenching method.The mechanical properties along the whole cross section were investigated by a nanoindentation method,and no evident variation of the Young's modulus and hardness was found,further indicating the single amorphous structure.Amorphous ring and tube-shape parts with different dimensions can be produced by this method.     

Effects of small amount Ta on the characteristics ofthe 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 ZrENi, CuZr2, AlEZr3 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.     

工业原料制备Zr-Cu基非晶合金及其压缩断裂行为研究

采用工业原料制备了Φ4 mm的Zr55Cu30Ni5Al10非晶合金棒材,利用XRD,DSC,SEM分析了该合金体系玻璃形成能力及压缩断裂行为.结果表明:Zr55Cu30Ni5Al10非晶合金棒材在10,15,20 K/s的升温速度下,过冷液相区△Tx分别为71.2,72.4,68.1 K,具有较大的玻璃形成能力.该非晶合金棒材抗压强度达到1 702 MPa,断口微观形貌为典型的脉络状花纹,在断口与试样连接处发现大量的剪切带存在,同时还产生了局部熔化现象.     

Chemical short-range order domain in bulk amorphous alloy and the prediction of glass forming ability

Since the discovery of bulk Zr-Ti-Cu-Ni-Be[1] and Pd-Ni-Cu-P[2] metallic glasses with ex-traordinary high glass forming (GFA) ability and critical cooling rate lower than 100 K/s, great attention has been paid to the structure of BMG alloys. Experimental results of X-ray and neutron diffraction or scattering have provided ample evidence that there is a short-range order in BMG alloys. Metallic glasses always exhibit strong compound forming tendency and the corresponding anomalies of t…     

Fabrication of Ti-based Amorphous Composite and Biocompatibility Research

Ti-based alloy Ti64Zr5Fe6Si17Mo6Nb2 (At %) and Ti70Zr6Fe7Si17 (At %) ribbons with a width of 3-5 mm and thickness of about 80 um were fabricated by a single roller spun-melt technique. The feature of the alloy composition satisfies the three empirical rules. Amorphous structures of both alloys were confirmed by the X-ray diffraction pattern. To test the biocompatibility, both alloys were cultivated in the simulate body fluid (SBF). After 15 days, the Ca phosphates depositions on alloys surfaces were gained....     

Fe基软磁非晶态合金的研究

从合金的非晶形成能力和磁性能两个方面对多组元铁基非晶Fe Ni P B(TM M)系和Fe Co Ni Zr Nb B(TM (Zr,Nb) M)系的成分设计进行了分析 ,采用单辊铜轮快速急冷 (quenching)的方法制取非晶条带 ,X射线衍射及透射电镜 (TEM)分析均证明 :本研究制得试样为均匀的非晶合金 .此外 ,从非晶合金的磁滞回线上可知 ,所制得的Fe基非晶合金具有良好的磁性能 .     

添加Mo元素对Fe40Co40Zr9B10Ge1合金晶化过程和磁性能影响

采用单辊快淬法制备Fe40Co40Zr9B10Ge1和Fe40Co40Zr5Mo4B10Ge1两种非晶合金,并在不同温度下对其进行热处理。利用XRD和VSM两种仪器对合金的微观结构和磁性能进行测试分析,研究Mo添加对Fe40Co40Zr9B10Ge1合金晶化过程和磁性能的影响。结果表明,两种合金在晶化初期均有α-Fe(Co)相从非晶基体析出,但高温热处理后的晶化产物不同,Mo添加减少了高温金属化合物的含量。低于675℃热处理,Mo添加降低了合金晶化过程中析出α-Fe(Co)相的晶粒尺寸和合金的矫顽力。     

Limitation of the Johnson-Mehl-Avrami equation for the kinetic analysis of crystallization in a Ti-based amorphous alloy

The primary crystallization of the Ti40Zr25Ni8Cu9Be18 amorphous alloy was studied by isochronal differential scanning calorimetry (DSC). The activation energy was determined by the Kissinger-Akahira-Sunose method. Trying to analyze the crystallization kinetics of the Ti40Zr25Ni8Cu9Bei8 amorphous alloy by two different methods, it was found that the crystallization kinetics did not obey the John-son-Meh1-Avrami equation. A modified method in consideration of the impingement effect was proposed to perform kinetic analysis of the isochronal crystallization of this alloy. The kinetic parameters were then obtained by the linear fitting method based on the modified kinetic equation. The results show that the isochronal crystallization kinetics of the amorphous Ti40Zr25Ni8Cu9Be18 alloy is heating rate dependent, and the discrepancy between the Johnson-Meh1-Avrami method and the modified method increases with the increase of heating rate.     

Fabrication of Ti-based amorphous composite and biocompatibility research

Ti-based alloy Ti64Zr5Fe6Si17Mo6Nb2 (At %) and Ti70Zr6Fe7Si17 (At %) ribbons with a width of 3–5 mm and thickness of about 80 um were fabricated by a single roller spun-melt technique. The feature of the alloy composition satisfies the three empirical rules. Amorphous structures of both alloys were confirmed by the X-ray diffraction pattern. To test the biocompatibility, both alloys were cultivated in the simulate body fluid (SBF). After 15 days, the Ca phosphates depositions on alloys surfaces were gained. Moreover, n(Ca)/n(P) atom ratio of the deposition is about 1.6/1, which approaches to that of human bone—1.66/1, suggesting that both alloys were with a favorable biocompatibility.     

Nd_(60)Al_(10)Ni_(10)Cu_(20)大块金属非晶的玻璃转变和晶化特性研究

用铜模吸铸法制得了一种直径为5 mm、成分为Nd60Al10Ni10Cu20的大块非晶合金.与富Fe类Nd基非晶不同的是,这种新型的Nd基大块非晶具有明显的玻璃转变过程和稳定的过冷液相区.磁性测试表明,在室温下表现为顺磁性.热分析实验发现,随着升温速率的增大,样品的过冷液相区变宽,并且玻璃转变温度和晶化温度有明显的向高温方向移动的趋势.研究了该大块非晶的玻璃转变动力学和晶化动力学,并给出了Kauzmann温度Tk,Vogel-Fulchers-Tamman温度T0g以及脆性系数m等重要参数.     

单纯手法复位与手法复位加敏使朗口服治疗良性阵发性位置性眩晕疗效分析

目的 比较单纯手法复 位 和 手 法 复 位 加 口 服 抗 眩 晕 药 治 疗 后 半 规 管 良 性 阵 发 性 位 置 性 眩 晕（PC ？BPP V ） 的疗效。方法 将2004 年1 月～2011 年6 月期间收治的236 例 BPP V 患 者 随 机 分 为 两 组, 对 照 组 112 例采用单纯手法复位, 治疗组124 例在手法复位基础上加敏使朗口服, 两组均于治疗后1 周和3 个月时复查, 比较其疗效。结果 治疗后1 周时, 对照组和治疗组的有效率分别为86 .61 % 和89 .52 % , 治疗后3 个月时对照组有效率92 .86 % （104／112 ） , 治疗组有效率为93 .54 % （116／124 ） , 两者比较差异均无统计学意义（P ＞0 .05 ） 。结论 单纯手法复位法和手法复位加口服抗眩晕药物治疗 BPP V 疗效相当。     

Compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni bulk metallic glasses

Starting from the quaternary Cu47Ti34Zr11Ni8 alloy, the compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni alloys was systematically investigated. Quaternary Cu-Ti-Zr-Ni alloys can be cast directly from the melt into copper molds to form fully amorphous strips or rods with the thickness of 3-6 mm. The evidence of the amorphous nature of the cast rods was provided by X-ray spectra. The measured glass transition temperature (Tg) and crystallization temperature (Tx) were obtained for the alloys using differential scanning calorimetry (DSC) at the heating rate of 20 K/s. In the results, the differences between the glass temperature and the crystallization tempera-ture (△Tx=Tx-Tg) are measured with values ranging up to 33-55 K. The reduced glass transition temperature (Trg), which is the ratio of the glass temperature to the liquidus temperature (T1), is often used as an indication of the glass-forming ability of metallic alloys. For the present Cu-Ti-Zr-Ni alloys, this ratio is typically in the range of 0.5838-0.5959, characteristic of metallic alloys with good glass-forming ability. The elastic constants for several selected alloys were measured using ultrasonic methods. The values of the elastic shear modulus, bulk modulus, and Poisson's ratio were also given.     

Self-cleaning glass coated with Fe~(3 )-TiO_2 thin film

1　INTRODUCTIONTheinfluenceofvariouschemicalsontheenvi ronmentisoneofthemostimportantsocialproblems .Therearemanywaystoabatethepollutionfromthechemicals .Oneofthemostpromisingtechniquesistooxidesuchchemicalsbyphotocatalysis .SinceFranketalreportedthepossibilityofusingTiO2 todecom posecyanideinwaterin 1977[1] ,therehasalsobeenincreasinginterestinenvironmentalapplicationsoftheoxide[2 4 ] .Althoughthemechanismoftitaniumdioxidephotocatalysishasbeenclarified ,therehavebeenfewsuccessfulindustr…     

Enhanced Corrosion and Wear Resistances of Zr-based Alloy Induced by Amorphous/Nanocrystalline Coating

To improve corrosion and wear resistances of the Zirconium(Zr) based alloys which are widely applied in nuclear reactors and chemical corrosion-resistant equipment, a new surface modification scheme was designed to deposit a Zr_(75)Cu_(25) coating on Zr substrate by using magnetron sputtering technique. The microstructure and the phase composition were characterized by scanning electron microscope, transmission electron microscope, and X-ray diffraction measurements. The tribological properties and the corrosion resistance were investigated by performing reciprocating tribo-tester and electrochemical tests, respectively.It is found that the Zr_(75)Cu_(25) coating is made up of a mixture of amorphous and a-(Zr) nanocrystalline phases.The nanocrystalline particles with a size of 5-10 nm are homogenously dispersed in the amorphous matrix.The Zr_(75)Cu_(25) coating shows excellent tribological properties, due to the dispersion strengthen caused by the homogeneous distribution of a-(Zr) nano-size particles among the amorphous matrix. In addition, it is revealed that the Zr_(75)Cu_(25) coating makes the Zr substrate exhibit excellent corrosion resistance, due to the robust passive film with a compact structure of the amorphous/nanocrystalline mixture.     

Effects of yttrium on the formation and magnetic properties of bulk metallic glassy （Fe, Co）-B-Si-Nb alloys

The bulk metallic glassy (BMG) rods of [(Fe0.5Co0.5)0.72B0.192Si0.048Nb0.04]100-xYx (x=0-6) and [(FexCo1-x)0.72B0.192Si0.04]Nb0.04]96Y4 (x=0.5-0.8) were prepared by copper mold casting. The structure, thermal stability,and magnetic properties of the samples were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and vibrating sample magnetometer (VSM). Adding lat% to 6at% of yt-trium, the bulk glassy alloy rods of [(Fe0.5Co0.5)0.72B0.192Si0.048Nb0.04]100-xYx (x=0-6) with the diameter of 3 mm were not formed, and the sample with 4at% of yttrium showed less crystalline phase than others. When the Fe/Co atomic ratio was between 5:5 and 7:3, the bulk glassy alloy rods of [(Fe1-xCox)B0.192Si0.048Nb0.04]96Y4 (x=0.5-0.8) with the diameter of 2 mm were fabricated. In the (Fe, Co)-B-Si-Nb-Y BMGs, when the Fe content increased, the thermal stability, the supercooled liquid region, and the glass-forming ability (GFA) decreased, but the saturation magnetization (Ms) increased.     

Zr_(65)Al_(7.5)Ni_(10)Cu_(15)Co_(2.5)合金的比热和热力学函数

采用差示扫描量热仪和差热分析仪测定了Ｚｒ６５Ａｌ７．５Ｎｉ１０Ｃｕ１５Ｃｏ２．５非晶合金的结晶温度和结晶焓、晶态的熔化温度和熔化焓、非晶态和晶态及液态的比热等热力学数据。在此基础上通过设晶态２９８Ｋ的自由焓为零，得到了晶态、非晶态和液态的热力学函数，据此研究了玻璃转变和真实玻璃转变温度，分析了理想玻璃转变温度、真实玻璃转变温度和实际测量的玻璃转变温度的关系。     

Ti-Fe-Cu合金的制备与性能

采用铜模吸铸法制备直径为3,6 mm的Ti64Fe18Cu18,Ti68Fe18Cu16,Ti70Fe18Cu12和Ti74Fe18Cu84种Ti-Fe-Cu合金圆棒,通过X射线衍射仪和光学显微镜观察该合金样品的微观组织结构,并对其进行压缩实验和抗腐蚀性能测试,研究合金样品的力学性能、抗氧化性能及耐腐蚀性能。结果表明:制备的Ti-Fe-Cu合金相主要是由立方cp2 Ti(Fe,Cu)金属间化合物和bccβTi固溶体组成;随着Cu含量的减少,Ti-Fe-Cu合金硬度和室温塑性逐渐增大,且最大压缩塑可达18%;此合金具有良好的抗氧化和抗腐蚀性能,与传统的Ti-6Al-4V合金相比,其制造成本更低,性能更优异。