Zr65Al7.5Ni10Cu15Co2.5合金的玻璃转变温度

根据Ｚｒ６５Ａｌ７。５Ｎｉ１０Ｃｕ１５Ｃｏ２。５合金的纳米晶，晶体，液体和玻璃比热的测量结果，研究了合金的玻璃转变温度与全金的热力学函数，动力学参数以及加热速度的关系。结果表明，非晶态合金玻璃转变所需转变激活能很小，玻璃转变温度实际上是由于加热速度引起的不同状态的玻璃与液体的热力学平衡温度。     

机械合金化合成Fe-Ni-C系非晶态合金

用机械合金化方法合成了Fe—Ni—C系非晶态合金,用X射线衍射仪对球磨不同时间的Fe—Ni—C系混合粉末进行了分析．结果表明：在Fe—Ni合金中加入C可促使其形成非晶;原子分数分别为Fe40Ni40C20、Fe60Ni20C20的混合粉末在一定的机械合金化条件下可获得非晶．     

机械合金化Co-Zr非晶软磁合金粉末的形成及热稳定性分析

研究了Co-Zr二元相图上4个共晶点成分配方Co90Zr10、Co53Zr47、Co35Zr65和Co21Zr79在球磨条件下的非晶态合金形成能力。采用X射线衍射和差热分析(DTA)对粉末的结构及热稳定性进行了分析。XRD分析结果表明,4种配方在一定的球磨时间内都能形成非晶态合金,其中非晶形成能力最强的为Co35Zr65。DTA分析结果表明,该合金系具有较高的热稳定性,并具有较高的非晶形成能力。球磨时间对非晶的形成有重要影响,球磨时间过长,使形成的非晶态合金粉体反而向晶体转化。     

机械合金化Fe—Ti合金非晶形成能力的研究

利用Ｘ光衍射和扫描电镜对机械合金化Ｆｅ－Ｔｉ非晶合金的形成过程进行了研究。试验表明，机械合金化非晶形成的过程可以分为二个阶段；粉末的破碎阶段和非晶的形成阶段。此外，对Ｆｅ－Ｔｉ合金形成非晶的成分范围进行了理论计算和试验测定。     

热处理对快凝Ni74Si10B16非晶合金热稳定性的影响

本文通过对快凝Ｎｉ７４Ｓｉ０１Ｂ１６非晶合金不同温度与时间下真空热处理样的差热描量热分析及Ｘ射线衍射分析发现，热处理来改变试样的非晶性时，热处理前后试样的晶化温度保持不变；当非晶基体中析出初晶Ｎｉ颗粒时，热处理样的初始晶化温度下降；进一步析出Ｎｉ３Ｂ等晶经相对，热处理样的晶化温度反而上升，根据以前建立的高类金属含量Ｎｉ基非晶合金的晶化机制，本文对此给出了比较合理的解释。     

非平衡合金固态合金化中氢化物的行为和影响的研究

本文以氢化物的形式在Ｆｅ和Ｔｉ元素混合粉机械合金化过程中引进氢原子。利用ＸＲＤ，ＴＥＭ，ＤＳＣ等实验手段探讨了氢原子对合金化和结构ＤＳＣ等实验手段探讨了氢原子对合金化和结构的影响，以及氢化物的分解过程。     

Mm合金化对Zr基贮氢合金电极性能的影响作用

本文研究探讨Ｍｍ合金化对难活化的ＡＢ２型Ｚｒ－Ｍｎ－Ｎｉ系贮氢合金的晶体结构,电化学容量及贮氢电极活化等特性的影响作用。Ｍｍ合金化加入可从根本上改善Ｚｒ系贮氢合金电极的活化性能。这与Ｍｍ合金化对贮氢电极合颗粒表面化学改性作用以及合金颗粒体内微结构改变等因素有关,ＸＲＤ分析表明Ｍｍ合金化后同氢后金晶体结构仍为Ｃ１５相,且其中的Ｃ１４型Ｌａｖｅｓ相含量明显增加,同时,也发现Ｍｍ合金化恶化了贮氢合金电化     

机械合金化制备负载型非晶态Ni－Nb纳米粒子催化材料

用机械合金化法制备了负载型非晶态Ｎｉ－Ｎｂ／ＳｉＯ２纳米粒子，粒径约为１０ｎｍ，硅胶的加入不仅大大加速了金属合金化的过程，而且使金属粒子比较均匀地分散在ＳｉＯ２中。这种材料比之单纯的纳米粒子更适合于作为催化剂。     

机械合金化Zr-Al-Ni-Cu-Ag非晶合金的晶化行为

研究了机械合金化非晶态Zr65Al7.5Ni10Cu7.5Ag10合金的晶化过程，由于存在扩散不均匀区，机械合金化非晶合金在深过冷液相区的退火组织不同于快淬合金，在深过冷液相区退火，析出二十面体准晶相及一些知相：在靠近第一个放热峰的温度退火，近出Zr2Cu相：第二个放热峰对应残余非晶相及准晶相向Zr2Ni,Zr2-Al3的转变。     

添加Co对Mg65Cu25Y10合金玻璃形成能力的影响

采用熔体铜模浇铸制备出具有不同厚度的Mg65Cu25-xCoxY10(x=2.5,5,7.5)合金薄板试样，利用X射线衍射确定铸态样品的非晶态性质，示差扫描量热计（DSC）分析合金的玻璃转变，晶化和熔化行为，在Mg65Cu25-xCoxY10合金中x小于5时，Co的添加对玻璃形成能力没有明显的影响，玻璃形成的临界厚度大约为2mm；但当x增加至7.5时，合金的玻璃形成能力明显下降，与无Co的合金相比较，含Co金属玻璃的玻璃转变温度Tg降低，过冷液态温度区间△Tx减小，但约化玻璃转变温度Trg没有明显的变化。     

Study of oxidation behaviour of Zr-based bulk amorphous alloy Zr65Cu17.5Ni10Al7.5 by thermogravimetric analyser

The oxidation behaviour of Zr-based bulk amorphous alloy Zr₆₅Cu_17.5Ni₁₀Al_7.5 has been studied in air environment at various temperatures in the temperature range 591–684 K using a thermogravimetric analyser (TGA). The oxidation kinetics of the alloy in the amorphous phase obeys the parabolic rate law for oxidation in the temperature range 591–664 K. The values of the activation energy and pre-factor as calculated from the Arrhenius temperature dependence of the rate constants have been found to be 1.80 eV and 2.12 × 10⁹ g·cm⁻²·sec^−1/2, respectively.     

Temperature and strain rate dependence of deformation behavior of Zr65Al7.5Ni10Cu17.5

In this work, the effects of temperature and strain rate on the deformation behavior of Zr₆₅Al_7.5Ni₁₀Cu_17.5 bulk metallic glass (BMG) were investigated. It was found that both temperature and strain rate had a significant influence on the deformation behavior of the BMG. The alloy exhibited Newtonian behavior at low strain rates but showed non-Newtonian behavior at high strain rates in the supercooled liquid region. However, the crystallization occurred slightly at a strain rate of 2 × 10^?4 s^?1 at the temperature of 693 K that is lower than the crystallization temperature Tx of Zr₆₅Al_7.5Ni₁₀Cu_17.5 BMG. The deformation mechanisms were discussed in terms of the transition state theory based on the free volume model.     

Hydrogen‐enhanced plastic deformation during indentation for bulk metallic glass of Zr65Al7.5Ni10Cu17.5

The effect of hydrogen charging on shear bands and plastic zone during Vickers indentation for Zr₆₅Al_7.5Ni₁₀Cu_17.5 bulk metallic glass has been studied. The results showed that hardness increased gradually with charging time and reached saturation. The shear bands and the size of the plastic zone on the surface and subsurface of indentation increased evidently when charging time was less then 40 h at i = 10 mA/cm² or 10 h at i = 100 mA/cm², respectively. After that, the size of the plastic zone began to reduce with charging time because hydrogen blisterings began formation and growth.     

机械合金化能量转换与Ni_(50)Ti_(50)非晶合金的形成

本文报道了球磨转速,装球量对 Ni_(50)Ti_(50)单质混合粉机械合金化的影响,并建立模型用于计算工艺条件对球磨能量转换的影响,进而讨论了它与机械合金化相变反应方式的关系。粉末在每次碰撞的变形能过高时,可能形成金属间化合物,而粉末经长时间球磨获得的总能量超过一定值将引起非晶的晶化。     

环境气氛对非晶Fe90Zr10合金条带表面状态的影响

分别在大气和氩气中制备了非晶Ｆｅ９０Ｚｒ１０。采用ＡＥＳ及ＸＰＳ，并结合氩离子原位溅射剥层，研究了气氛对条带自由侧及贴辊侧表面状态的影响，结果表明，在大气中制备时，条带自由侧的Ｚｒ显著偏聚，贴辊侧发生了Ｆｅ的偏聚。而在氩气中制备时，条带两侧表层的成分分布及氧化层厚度基本相同，均被一薄的氧化铁覆盖．     

Cu对Fe基非晶合金内禀磁性及晶化行为的影响

利用 DSC,XRD,TEM,M(?)ssbauer 谱及磁性测量技术研究了 Cu 取代 Fe 对 FeSiB 非晶合金的内禀磁性及晶化行为的影响。结果表明:Cu 元素取代 Fe 使 FeSiB 非晶合金的λ_s,σ_s,(?)_f,(?)_(Fe)下降,但居里温度 T_c 升高。而且,Cu 的加入能够显著地降低 FeSiB 非晶合金的晶化温度及晶化激活能,改善x-Fe(Si)相的形貌。FeCuSiB 非晶合金的晶化行为表明:在非晶合金内部存在α-Fe(Si)相成分富集区。     

Dynamic mechanical relaxation behavior of Zr35Hf17.5Ti5.5Al12.5Co7.5Ni12Cu10 high entropy bulk metallic glass

Non-equiatomic high entropy bulk metallic glasses were reported recently and show unique mechanical and physical properties.Dynamic mechanical relaxation behavior of Zr35Hf17.5Ti5.5Al12.5C07.5Ni12Cu10 high entropy bulk metallic glass was investigated by dynamic mechanical analysis(DMA)and the mechanical spectra could be well described by the quasi-point defects(QPD)theory.Compared to typical metallic glasses,the intensity of the β relaxation of Zr35Hf17.5Ti5.5Al12.5Co7.5Ni12Cu10 high entropy bulk metallic glass is lower due to the sluggish diffusion.At the same time,the correlation factor χ is higher than that of conventional metallic glasses and this is ascribed to the high configuration entropy.In paral-lel,physical aging below the glass transition temperature leads to a decrease of atomic mobility,caused by a decrease of the concentration of defects.