Zr65Al7.5Ni10Cu17.5和Zr65Al10Ni10Cu15合金的非晶和晶态薄带吸氢行为研究

研究两种不同成分具有较大过冷液相区的四元合金Zr65Al7.5Ni10Cu17.5和Zr65Al10Ni10Cu15，非晶和晶态薄带吸氢行为，结果表qt两种薄带的吸氢量均随着温度的升高而增大，非晶薄带的吸氢量要小于同等条件下的晶态薄带的吸氢量且只有在673K吸氢后形成了氢化物，Zr65Al7.5Ni10Cu17.5非晶和晶态薄带吸氢后分别生成了Zr2NiH4.7和ZrH2；而Zr65Al10Ni10Cu15非晶和晶态两种薄带最后生成的氢化物同为ZrH2。     

Zr65Al10Ni10Cu15非晶合金电阻率的研究

在不同加热速率下利用恒流四电极法研究了非晶合金Zr65Al10Ni10Cu15的电阻率随温度的变化情况,根据电阻率随温度的变化情况可以把晶化前的温度区间分为3个阶段,第一和第二阶段分别对应于低温结构弛豫和高温度结构弛豫发生的温度区间,而第三阶段的变化情况与前二个阶段明显不同,并在晶化前出现电阻率极大值峰。研究表明,利用电阻率随温度的变化情况,可以反映出非晶更多的结构转变的信息。     

锆基激光熔覆涂层组织结构及性能

在纯钛(TA2)基体上激光熔覆了Zr65Al75Ni10Cu17.5合金粉末，对涂层进行了XRD，SEM和TEM分析。研究发现，涂层由金属间化合物 少量的非晶组成。这种具有高比强度、高硬度和高抗氧化性的金属间化合物与非晶相的复合组织，具有较好的力学性能。在Zr65Al75Ni10Cu17.5合金粉末中添加w(B)2％和w(Si)2．75％，发现涂层中非晶含量增加，硬度升高。两种涂层的最高硬度分别达到HK909．6和HK1444．8。     

Cr23C6,CrB/Ni3Al/γ-Ni激光复合涂层研究

在低碳钢基底表面激光熔覆Ni60AAA与镍包铝的混合粉,利用扫描电镜、能谱仪以及X射线衍射等分析手段对涂层组织结构进行了分析.结果表明,涂层主要包含γ-Ni、Ni<,3>Al、Cr<,23>C<,6>和CrB相,其中先共晶γ-Ni为主要基体相,呈树枝晶形貌,Ni<,3>Al相也呈树枝晶形貌,游离、均匀分布于涂层;共晶体呈网状分布于两种树枝晶的晶界上;适当提高熔覆功率可以改善涂层的成形性及表面质量,在2.2 kW功率下,Ni60AAA与镍包铝激光合金涂层完整、致密,涂层与基体实现了完全冶金结合.     

激光熔覆Ni3Si基复合涂层相、组织及高温抗氧化性能研究

采用激光熔覆技术在镍基高温合金GH864表面制备了原位合成碳化物TiC、NbC陶瓷颗粒增强Ni3Si金属间化合物基复合涂层，采用XRD、SEM和EDAX等方法，对熔覆层相、组织进行了表征。采用循环氧化法研究了熔覆层在1100℃下的高温抗氧化性能。     

激光熔覆Ni 包Al+1%Y2 O3 覆层的组织分析

以Ni 包Al 粉末和少量Y2O3 粉末为原料,在20 钢基体表面激光熔覆Ni-Al 金属间化合物,获得了质量良好的熔覆层。运用光学显微镜、扫描电子显微镜分析了熔覆层的组织结构,利用能谱仪、X-ray 衍射仪分析了熔覆层的成分与相结构,研究了热处理对其组织、性能和有序化的影响。结果表明:熔覆层主要由Ni3Al,γ-(Fe,Al),NiAl,AlNiY 和Al2Y 等相组成,热处理后,Ni3Al 相由无序化转变成有序化,并且NiAl 相的有序化得以保留。     

Fe3Al金属间化合物激光熔覆层的组织结构

以纯Fe3Al粉为主要原料在钢基体表面激光熔覆Fe3Al金属间化合物。利用扫描电镜、能谱仪、X射线衍射等法对熔覆合金层、合金层与钢基体的结合界面等进行了显微组织及相结构的分析。实验结果获得了致密、无肉眼可见气孔、夹杂物,但存在少量裂纹的合金层,合金层与基体间完全冶金结合;熔覆合金层主要由单相Fe3Al构成,覆层组织为粗大等轴状晶团,等轴状晶团由大量极细小的条状Fe3Al晶粒构成,一些相邻的条状晶粒之间具有基本一致的晶体学取向。     

激光熔覆TiFe/β-Ti复合涂层组织及耐磨性

以Ti85-Fe15合金粉末为原料,利用激光熔覆技术在TA15钛合金表面制得了由β-Ti初生树枝晶和枝晶间TiFe金属间化合物组成的复合涂层,研究了涂层的显微组织及室温耐磨性能.结果表明,该涂层在室温干滑动磨损条件下具有优异的耐磨性能.     

钛合金激光熔覆TiB-TiC增强TiNi-Ti2Ni金属间化合物复合涂层的组织和耐磨性（英文）

以Ti＋Ni＋B4C粉末混合物为原料,利用激光熔覆技术在TA15钛合金基材表面制得TiB-TiC共同增强TiNi-Ti2Ni金属间化合物复合涂层。采用OM、SEM、XRD、EDS及AFM等手段分析激光熔覆涂层的显微组织及磨损表面,测试涂层的室温干滑动磨损性能。结果表明,激光熔覆TiB-TiC增强TiNi-Ti2Ni金属间化合物复合涂层熔覆具有独特的显微组织,菊花状的TiB-TiC共晶均匀分布在TiNi-Ti2Ni双相金属间化合物基体中。由于高硬、高耐磨TiB-TiC陶瓷相与高韧性TiNi-Ti2Ni双相金属间化合物基体的共同配合,激光熔覆涂层表现出优异的耐磨性。     

不同直径的Zr60.3Ni16.2Cu13.5Al10块体非晶合金的力学性能

采用铜模吸铸法制备了阶梯型的Zr60.3Ni16.2Cu13.5Al10非晶合金,利用X射线衍射(XRD)分别对直径为3 mm、4 mm、6 mm的合金试样进行结构分析,利用万能试验机及扫描电镜对试样进行压缩试验和断口形貌分析.研究表明,由于冷却速度的影响,直径为3 mm时是非晶结构,直径为4 mm和6 mm时是中心晶体和表面非晶体混合结构;对于Zr60.3 Ni16.2Cu13.5Al10合金,直径为3 mm时断裂强度可达到1 775 MPa,塑性变形可达到2.02%,而直径为4 mm的非晶复合材料的塑性变形可达2.93%,适当体积的晶体相的加入可以有效地提高非晶材料的塑性.     

Zr65Al7.5Ni10Cu17.5块状非晶晶化过程的电镜研究

用透射电镜对Zr65Al7.5Ni10 Cu17.5块状非晶合金的晶化过程进行了研究。发现晶化过程的不同阶段相的组成是不同的。710K时 ,主要是tI CuZr2 相和tP Al2 Zr3 相 ,两者有固定的取向关系 :[0 10 ]tI∥ [0 10 ]tP,(10- 3) tI∥(2 0 2 ) tP。在 76 0K时 ,除了前面的两个相外 ,又出现了hP2 Al2 NiZr6相和hP3 α Zr相 ,两者也有固定取向关系 :[113]hP2 ∥ [0 0 1]hP3 ,(14- 1) hP2 ∥ (2 1- 0 ) hP3 。根据它们的晶格常数的相似性可以把晶化相归纳为两类 :tI ,oC ,hP3 和tP ,hP1,hP2 。这些相都是Zr基的 ,但前者富Cu和Ni,后者富Al。用电镜得到的结果来标定X射线衍射谱 ,结果吻合很好。     

Zr65Al7.5Cu17.5Ni10大块非晶态合金的制备及晶化过程

采用直接水淬法成功制备直径５ｍｍ球状Ｚｒ６５Ａｌ７．５Ｃｕ１７．５Ｎｉ１０大块非晶态合金。Ｘ射线衍射、透射电镜检验证明样品完全为非晶态。采用Ｘ射线衍射、差示扫描热分析仪（ＤＳＣ）分析了Ｚｒ６５Ａｌ７．５Ｃｕ１７．５Ｎｉ１０非晶态合金的晶化过程,利用Ｋｉｓｓｉｎｇｅｒ方程求得Ｚｒ６５Ａｌ７．５Ｃｕ１７．５Ｎｉ１０非晶合金的晶化表观激活能。Ｘ射线衍射实验结果表明,Ｚｒ６５Ａｌ７．５Ｃｕ１７．５Ｎｉ１０非晶态合金的晶化是按下面的次序进行的,非晶态合金→体心立方晶相Ｚｒ２（Ｎｉ,Ａｌ）＋非晶相→体心立方相Ｚｒ２（Ｎｉ,Ａｌ）＋体心立方相Ｚｒ２（Ｃｕ,Ａｌ）。     

Phases in the crystallization process of Zr_(65)Al_(7.5)Ni_(10)Cu_(17.5)metallic glass

The crystallization process of metallic glass Zr65Al7.5Ni10Cu17.5, (atom fraction in %) were studied by transmission electron microscopy and X-ray diffraction. Two stages of crystallization process, which are indicated by the two exothermic peaks in the differential scanning calorimetry diagram, were studied separately. It is found that the phases in the various stage of the crystallization are different, In the first stage, it consists mainly of tI-CuZr2 and tP-Al2Zr3 phases, between which a definite orientation relationship is found. While in the second stage, in addition to the above phases, phase hP2-Al2NiZr6 and phase hP3-α-Zr appear, between which another orientation relationship is also found. At the same time, a comparison is made based on the study of the phases exist in the arc-melted master ingot. The lattice parameters of the identified phases were determined and some interesting similarities were found. According to these similarities, all the phases were classified into two groups. The fi     

非晶态Zr65Cu17.5Ni10Al7.5合金氧化和晶化过程研究

利用X射线衍射（XRD）和差示扫描量热法（DSC）研究了在连续加热条件下非晶态Zr65Cu17.5Ni10Al7.5合金在空气中的氧化和晶化过程。结果表明，在450℃以下，非晶态Zr65Cu17.5Ni10Al7.5合金表面的ZrO2晶粒长大过程服从抛物线规律；当温度超过450℃时，由于非晶基体内部发生晶化过程，阻碍了表面氧化过程的发展，此时ZrO2晶粒大小满足线性规律，并给出了ZrO2晶粒尺寸与温度的函数表达式。非晶态Zr65Cu17.5Ni10Al7.5合金的晶化过程是先形成二十面体相，然后转变为稳定的晶化相。     

轧制对Zr65Al7．5Ni10Cu17．5块体非晶合金硬度的影响

用等速率连续加热退火获得不同驰豫态的Zr65Al7.5Ni10Cu17.5块体非晶合金,在室温下对其进行轧制变形,分析变形后材料的结构.结果发现,最大变形量为95%时,该非晶合金仍然保持单一的非晶结构,不断进行的轧制变形仅是在其中引入了逐渐增多的剪切带,非晶合金的硬度也因此而不断下降.非晶合金在变形前的弛豫程度越高,硬度下降的越快.虽然非晶合金的自由体积在应变量大于80%时达到饱和,但随变形量的提高硬度继续下降.     

Progress of solid-state reaction and glass formation in mechanically alloyed Zr65Al7.5Cu17.5Ni10

The progress of amorphization in mechanically alloyed Zr₆₅Al_7.5Cu_17.5Ni₁₀ powder was investigated in detail using x-ray diffraction, Rietveld analysis, magnetic measurements, metallography, as well as scanning and transmission electron microscopy. For this purpose mixtures of elemental powders were used as starting materials and milled for distinct periods of time. Detailed investigations of the microstructural evolution during milling indicate that the amorphization proceeds by solid-state reaction, similar to what is known for mechanical alloying of binary alloy systems and other multicomponent alloys. A layered structure typical for mechanically alloyed material arises in the early stages. Alloying of the lamellae, which consist of pure elements, proceeds to some extent via anomalous fast diffusion of small-sized atoms. Besides this, the larger atoms also contribute to alloying. The observed reaction paths are compared with well-known models describing the amorphization by solid-state reaction in binary systems, suggesting that dislocation pipe diffusion plays a decisive role for intermixing the elements and promoting amorphization.     

Nanocrystallization of Zr61Al7.5Cu17.5Ni10Si4 metallic glass

The primary nanocrystallization behavior and microstructural evolution of the Zr₆₁Al_7.5Cu_17.5Ni₁₀Si₄ alloy during annealing were investigated by isothermal differential scanning calorimetry, X-ray diffractometry and transmission electron microscopy. During continuous heating of the 4Si and the base (contains no Si) amorphous alloys at a heating rate of 10 K/min, the saturation point of nucleation for the 4Si amorphous alloy occurs at a crystallization fraction of 78%, which is significantly higher than 65% for the base alloy, implying that these metalloid atoms would extend the nucleation stage and refine crystalline particles. The sequence of crystallization phase from the amorphous matrix for the isothermally annealed 4Si amorphous alloy at 703 K is observed to be Zr₂Cu and Zr₂Ni at the early stage, Zr₃Al at an intermediate stage, and Zr₂Si at the final stage. Moreover, enrichment of Si atoms at the interface between Zr₂Cu crystal and the amorphous matrix is detected. This may result in increasing the thermal stability of the remaining amorphous phase and retardation of the crystal growth of Zr₂Cu particles.     

块状非晶态合金Zr65Al7.5Ni10Cu17.5的室温单轴压缩断裂行为

利用IUTM和SEM研究了Zr65Al7 5Ni10Cu17.5块状非晶合金的室温单轴压缩变形和断裂行为.该合金的室温压缩变形过程主要表现为弹性和塑性变形,并且塑性变形阶段没有加工硬化现象.宏观形貌观察发现样品形成与压缩方向呈约45°的变形带.塑性变形以剪切带粘性流层相对滑动的方式进行,在变形过程中形成脉络状断面形貌.裂纹于塑性变形积累到一定程度之后,在切变变形较大的区域表面形成.裂纹从萌生、扩展到断裂,时间极短.流变积累和应力集中综合作用的结果导致断裂.