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1.
大块锆基非晶合金电化学耐腐蚀行为的试验研究   总被引:1,自引:0,他引:1  
利用电化学极化曲线方法研究了Zr41Ti14Cu12.5Ni5Be22.5Fe5非晶合金及成分相同的晶化合金及纯Zr在硫酸溶液中的腐蚀行为。利用减重法研究了Zr41Ti14Cu12.5Ni5Be22.5Fe5非晶合金及成份相同的晶化合金在浓硫酸溶液中的腐蚀行为。极化曲线测试结果表明,非晶合金及成分相同的晶化合金与纯金属Zr有很大差异:非晶合金过钝化电位最高,钝化区最长,而纯金属Zr过钝化电位最低;钝化区也最短。减重试验表明,非晶合金的腐蚀速率是成分相同晶化合金的1/4。以上结果表明非晶合金拥有优良的耐腐蚀性能。  相似文献   

2.
黎阳 《上海钢研》2004,(3):27-27
Liquidmetal Technologies是全球第一家专门生产大块非晶合金的公司。此公司成立于1987年,被认为是较权威的国际非晶科技研究组织。由于液态金属技术不断发展,大块金属玻璃(BMG)已能应用在很多领域,如体育运动产品、电子产品、医药以及国防领域等。  相似文献   

3.
非晶合金,又称为金属玻璃(MG),是一种新型的多功能材料,具有长程无序,短程有序的原子结构。由于不存在晶粒、晶界及位错等缺陷,非晶合金具备一系列优异的综合性能,在众多领域有着极大的应用前景,受到众多学者的广泛关注。但非晶合金的形成受到玻璃形成能力以及冷却速率的限制,使得该材料的尺寸远小于传统金属材料,极大地限制了其在工程领域的推广及应用。针对如何突破非晶合金尺寸限制的问题,研究学者们给予了充分的关注及和研究。简要介绍了非晶合金的发展历史,总结了临界尺寸≥15 mm的非晶合金成分及其制备方法,同时阐述了获得较大尺寸非晶合金的策略,包括根据经验准则、高通量制备及表征、机器学习得到高玻璃形成能力(GFA)的合金成分设计方法以及低温热塑性连接、焊接、放电等离子烧结及3D打印的获得大尺寸非晶合金的制备技术,并对这些方法的发展提出展望。  相似文献   

4.
综述了块状金属玻璃的研究进展,介绍了块状金属玻璃的应用及几种制备方法,阐明了块状金属玻  相似文献   

5.
采用单辊旋淬法制备了Cu50Zr42Al8,Cu46 Zr47-xAl7Yx(x=2,5),Cu43Zr42AlsAg7和Cu43Zr42Al8Ag5 Y2非晶合金薄带,利用X射线衍射和差示扫描量热分析研究了合金样品的玻璃形成能力和热稳定性.结果表明,在Cu50Zr42Al8中添加适量的Ag、Y后使得非晶合金的短程有序结构发生改变.合金Cu46Zr47-xAl7Yx(x=2,5)的过冷液相区宽度ΔTx分别比Cu50 Zr42 Al8增加了19K、30K,约化玻璃转变温度Trg从0.565分别增加到0.579和0.566,参数γ从0.402分别增加到0.418和0.420,说明Y的添加提高了非晶合金的热稳定性和玻璃形成能力.合金Cu43Zr42 Al8Ag7和Cu43Zr42Al8Ag5Y2与Cu50Zr42Al8相比,约化玻璃转变温度Trg及参数γ均有了明显的提高,达到了0.619、0.416和0.609、0.411,表明Ag的添加、Ag和Y的同时添加均提高了Cu - Zr -Al系非晶合金的玻璃形成能力,但Ag的效果更加显著.  相似文献   

6.
大块非晶合金的制备、性能与应用研究进展   总被引:1,自引:0,他引:1  
大块非晶舍金由于其独特的结构和优异性能而得到广泛的研究。本文从大块非晶合金的制备原理和工艺、性能以及应用三方面详述了大块非晶研究概况和进展,并针对存在的问题提出了建议,最后提出了今后大块非晶发展的方向。  相似文献   

7.
金属锶及其合金的研究现状与应用   总被引:6,自引:1,他引:6  
对现有金属锶及其合金(Al-Sr,Mg-Sr,Si-Sr,Cu-Sr,Pb-Sr等合金)的制备技术(真空热还原法、熔盐电解法等)和优缺点、应用现状等进行了分析、比较,并对几种锶合金的相图及合金热力学的研究现状进行了综述。同时指出了我国锶产业发展过程中存在的不足及发展方向。  相似文献   

8.
块体金属玻璃的研究现状   总被引:1,自引:0,他引:1  
介绍了块体金属玻璃的研究和进展。阐述了常见的制备块体金属玻璃的主要方法,如熔体水淬法、铜模吸铸法、熔体喷铸与真空吸铸相结合的制备技术、压铸法、定向凝固铸造法、磁悬浮熔炼铜模冷却法、以金属玻璃为基复合材料的制备方法以及金属玻璃合金丝和管的制备,简要说明了块体金属玻璃的性能特征及应用,并提出了研究过程中值得重视的三个问题。  相似文献   

9.
10.
羰基金属复合材料的研究与应用   总被引:2,自引:0,他引:2  
本文对羰基金属复合材料的制备方法、研究现状及进展、以及羰基金属复合材料的应用前景进行了综述.  相似文献   

11.
考察在过冷液相区内790K+30min保温后炉冷和液氮冷却对Cu50Zr42Al8压缩断裂行为的影响。5mm铸态非晶复合棒的屈服强度、断裂强度和杨氏模量分别为1670MPa,1849MPa和104.4GPa,塑性应变为1.9%。经炉冷和液氮冷却试样的压缩断裂强度和杨氏模量下降,分别为912,678MPa和38,56.5GPa。液氮冷却试样为部分非晶结构,炉冷试样完全晶化。晶化相均为正交晶相Cu10Zr7,四角晶相CuZr2和DO3结构的AlCu2Zr三种脆化相。  相似文献   

12.
Multicomponent alloys with high entropy of mixing,e.g.,high entropy alloys (HEAs)and/or multiprin-cipal-element alloys (MEAs),are attracting increasing attentions,because the materials with novel properties are being developed,based on the design strategy of the equiatomic ratio,multicomponent,and high entropy of mixing in their liquid or random solution state.Recently,HEAs with the ultrahigh strength and fracture toughness,excel-lent magnetic properties,high fatigue,wear and corrosion resistance,great phase stability/high resistance to heat-softening behavior,sluggish diffusion effects,and potential superconductivity,etc.,were developed.The HEAs can even have very high irradiation resistance and may have some self-healing effects,and can potentially be used as the first wall and nuclear fuel cladding materials.Serration behaviors and flow units are powerful methods to understand the plastic deformation or fracture of materials.The methods have been successfully used to study the plasticity of amorphous alloys (also bulk metallic glasses,BMGs).The flow units are proposed as:free volumes,shear transi-tion zones (STZs),tension-transition zones (TTZs),liquid-like regions,soft regions or soft spots,etc.The flow units in the crystalline alloys are usually dislocations,which may interact with the solute atoms,interstitial types,or sub-stitution types.Moreover,the flow units often change with the testing temperatures and loading strain rates,e.g., at the low temperature and high strain rate,plastic deformation will be carried out by the flow unit of twinning,and at high temperatures,the grain boundary will be the weak area,and play as the flow unit.The serration shapes are related to the types of flow units,and the serration behavior can be analyzed using the power law and modified power law.  相似文献   

13.
The metallic glass matrix composites(MGMCs)and bulk metallic glasses(BMGs)were studied by statistical analysis during plastic deformation at the strain rates of 2×10~(-2),2×10~(-3),and 2×10~(-4) s~(-1),respectively.No serration events occur in both MGMCs and BMGs during compression tests at the strain rate of 2×10~(-2) s~(-1).When deformed at the strain rate of 2×10~(-3) s~(-1),the BMG displays a larger plasticity,which is due to the larger serration events followed by a series of small serrations caused by the continuous movement of free volume.The amplitudes and elastic-energy densities increase with increasing the strain rates owing to many serrations in MGMCs.It is deduced that the Young′s modulus decreases from the normalized stress drop and fluctuations are observed on stressstrain curves,which is attributed to a lower coefficient according to the stick-slip model.  相似文献   

14.
采用铜模吸铸法成功制备了Cu50Zr42Al8块状非晶,用纳米压痕法研究了铸态和低于玻璃化转变温度(Tg)退火后试样的力学性能,等温退火后试样的塑性增加而硬度和弹性减小。  相似文献   

15.
The corrosion behavior study was conducted on a novel Fe_(77)Mo_5P_9C_(7.5)B_(1.5)in-situ metallic glass matrix composite(MGMC).This composite sample was developed by introduction of bccα-Fe dendrites as reinforcing phase.The corrosion behavior of this composite was compared to its monolithic counterpart and other Fe-based alloys such as 304 Land 2304Lstainless steels.The corrosion resistance of MGMCs in H_2SO_4 solution shows inferior to that of other Fe-based alloys.Experiments suggest that Fe-BMGs samples possess better corrosion resistance property than that of Fe-MGMCs.The possible underlying reasons can be the inhomogeneity induced by the precipitation ofα-Fe dendrites in the MGMCs.  相似文献   

16.
High entropy bulk metallic glasses show promising mechanical and physical properties.Dynamic mechanical properties of Ti_(16.7)Zr_(16.7)Hf_(16.7)Cu_(16.7)Ni_(16.7)Be_(16.7)high entropy bulk metallic glass were investigated by mechanical spectroscopy(or called dynamic mechanical analysis).The main(α)relaxation was observed in the framework of the loss modulus G″,which is related to the dynamic glass transition behaviour for the glassy materials.From physical model point of view,dynamic mechanical properties of the Ti_(16.7)Zr_(16.7)Hf_(16.7)Cu_(16.7)Ni_(16.7)Be_(16.7)high entropy bulk metallic glass show good agreement compared with the quasi-point defects theory.  相似文献   

17.
拉伸速率对金属材料的室温拉伸性能影响很大,文章介绍了不同应变速率对钛合金Ti6Al4V(TC4)、TA15和Ti1023室温拉伸性能影响的研究进展,并通过分析和归纳,阐述了第一应变速率和第二应变速率对钛合金的抗拉强度、屈服强度、断后伸长率及断面收缩率的影响程度和规律,最后对应变速率对钛合金室温拉伸性能影响研究的发展方向进行了展望。  相似文献   

18.
扼要介绍了Ti 4Al 0 0 0 5B钛合金大型环件的制造过程。对 182 0mm× 14 2 0mm× 2 67mm环件进行了超声波检验 ,并对其实物进行了解剖、测试。试验结果表明 ,该环件弦向、径向和轴向 3个方向的力学性能均达到了零件设计要求的水平。  相似文献   

19.
There exists a great need for the development of high performance alloys due to increasing demands for energy conservation and environmental protection. Application of strip casting shows a strong potential for the improvement of properties of existing alloys and also for the development of novel alloy systems with superior properties. The present paper reviews our Center's activities in the development of high performance alloys by strip casting. Examples include (1) Al alloys, (2) wrought Mg alloys, and (3) bulk metallic glass (BMG) alloys.  相似文献   

20.
Nd55-x Al10+x Fe15 (x =0, 5, 10) bulk glass-forming alloys with distinct glass transition in differential scanning calorimetry (DSC) traces were obtained by suction casting, The glass forming ability (GFA) of the alloys was investigated. It was found that the reduced glass transition temperature (Trg) and the parameter γ of the alloys increased with the increasing concentration of Al. The glass formation enthalpy of the alloys was calculated based on Miedema's model, and it was suggested that the GFA of the alloys could be enhanced by the decrease of the glass formation enthalpy with Al additions.  相似文献   

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