高铝锌基合金（ZA）     

张兰英 《广东海洋大学学报》1995,(2)

高铝锌基合金是７０年代发展起来的一类新型合金。运用材料科学理论综合分析了国内外专家和研究人员在高铝锌基合金的组织、凝固特点与铸造性能、机械性能、耐蚀性能、热强性方面的研究现状．指出了存在的问题，提出了几点建议。  相似文献   

西藏罗布莎铁族元素金属互化物矿物及其成因探讨   总被引：2，自引：1，他引：2  

施倪承  李国武熊明 马喆生 《岩石矿物学杂志》2005,24(5):443-446

对西藏罗布莎铬铁矿中的铁族元素金属及金属互化物矿物进行了X射线衍射测定,结果显示其归属于镍纹石、自然铁、钴铁矿及铁镍矿4种矿物。它们与超高压矿物方铁矿、铂族元素矿物等连生,形成于深部的高还原环境,矿物的化学成分与地核十分相近,故认为它们可能来自于地幔及地核。  相似文献   

中国大陆科学深钻主孔中FeCrNi合金球粒的发现     

任玉峰方青松  白文吉杨经绥 戎合颜秉刚  张仲明许志琴 《岩石矿物学杂志》2005,24(5):485-488

在中国大陆科学深钻主孔中发现了2粒FeCrNi合金球粒,粒径约200μm,其中w(Fe)=71.07%~73.68%,w(Cr)=14.55%~16.79%,w(Ni)=9.91%~11.47%,总和为98.2%~99.65%,分子式为Fe0.74Cr0.16Ni0.10。球粒内均含氧化物包体,由Cr、Mn、Al、Si、Fe、Ti和O组成。X射线衍射分析表明,FeCrNi球粒为多晶,具立方晶系的晶体结构,空间群为Fm3m,晶胞参数为a=0.3603nm,Z=4,密度为7.828g/cm3。球粒经抛光后呈银灰色,金属光泽,平均莫氏硬度为4.026,主波长S546反射率为56%。球粒可能是FeCrNi合金组成的金属熔融液滴冷却的产物。  相似文献   

基于状态空间法的SMA-复合支座隔震结构分析     

刘海卿  陈小波  王学庆 《地震工程与工程振动》2007,27(5):173-176

研究了SMA(shape memory alloy)绞线-叠层橡胶复合支座的工作原理,将结构控制理论中的结构状态空间法应用到该复合支座隔震结构的数值模拟分析中。建立了普通框架、安装叠层橡胶支座和安装SMA复合支座框架的结构状态方程,应用SIMULINK工具箱建立结构仿真模型,得出不同条件下框架结构的时程反应曲线。通过对比分析可以看出SMA-复合支座能很好地改变结构的隔震效果,应用状态空间法进行SMA-复合支座隔震结构的数值模拟分析简单准确。  相似文献   

Potassium partitioning into molten iron alloys at high-pressure: Implications for Earth's core     

M.A. Bouhifd  L. Gautron  V. Malavergne  D. Andrault 《Physics of the Earth and Planetary Interiors》2007,160(1):22-33

The partition coefficients of potassium, D_K, between molten sanidine, KAlSi₃O₈, and molten roedderite, K₂Mg₅Si₁₂O₃₀, with FeS-rich alloy and pure Fe metal liquids have been investigated in a multi-anvil press, between 5 and 15 GPa, at a temperature of 2173 K, and at an oxygen fugacity between 0.5 and 3 log units below the iron-wüstite (IW) buffer. No pressure dependence of the D_K coefficients in sulphur-free and sulphur-bearing systems was found within the investigated pressure range. We also observed minor effect of the silicate melt composition for an nbo/t (non-bridging oxygen to tetrahedral cation ratio) higher than 0.8 ± 0.4. In contrast, the partitioning of potassium varies strongly with the metallic phase composition, with an increase of K-solubility in the metallic liquid for high sulphur and oxygen contents.We review all available high-pressure data to obtain reliable D_K coefficients for the interaction between molten silicates and Fe-alloy liquids at pressures and temperatures relevant to those of core formation in a terrestrial magma ocean. The dominant controlling parameters appear to be the temperature and the chemical composition of the metallic phase, with D_K coefficients significantly increased with temperature, and with the sulphur and oxygen contents of the Fe-alloy liquid. Our considerations distinguish two extreme cases, with an S-free or S-bearing iron core, which yield K contents of ∼25 or ∼250 ppm, respectively. These two extreme values have very different consequences for thermal budget models of the Earth's core since its formation.  相似文献   

科学超深井钻探铝合金钻杆的腐蚀失效分析          下载免费PDF全文

梁健  顾艳红  岳文  孙建华  刘俊秀  杨远航 《探矿工程》2017,44(2):60-66

针对铝合金钻杆在复杂的超深井钻井工程服役条件,分析了铝合金钻杆腐蚀行为的主要外在钻井工程因素,并进行了松辽盆地资源与环境深部钻探“松科二井”铝合金钻杆工程试样腐蚀程度的测试与分析。分析结果表明：钻杆结构、磨损与应力、钻井液介质、井内高温高压是其产生腐蚀的主要服役条件因素;铝杆体与钢接头连接处的腐蚀情况最为严重,铝杆体次之,加厚端部分耐蚀性最好;腐蚀产物的主要成分是Al2O3和Al(OH)3相。  相似文献   

Thermal equation of state of iron and Fe0.91Si0.09     

J. Zhang  F. Guyot 《Physics and Chemistry of Minerals》1999,26(3):206-211

We have carried out an in situ synchrotron X-ray diffraction study on iron and an iron-silicon alloy Fe_0.91Si_0.09 at simultaneously high pressure and temperature. Unit-cell volumes, measured up to 8.9 GPa and 773 K on the bcc phases of iron and Fe_0.91Si_0.09, are analyzed using the Birch-Murnaghan equation of state and thermal pressure approach of Anderson. Equation of state parameters on iron are found to be in agreement with results of previous studies. For both iron and Fe_0.91Si_0.09, thermal pressures show strong dependence on volume; the (∂K_T/∂T)_V values are considerably larger than those previously reported for other solids. The present results, in combination with our previous results on ɛ-FeSi, suggest a small dependency of the room-temperature bulk modulus upon the silicon content, less than 0.3 GPa for 1 wt.% silicon. We also find that substitution of silicon in iron would not appreciably change the thermoelastic properties of iron-rich Fe−Si alloys. If this behavior persists over large pressure and temperature ranges, the relative density contrast between iron and iron-rich Fe−Si alloys at conditions of the outer core of the Earth could be close to that measured at ambient conditions, i.e., 0.6% for 1 wt.% Si. Received: 13 January 1998 / Revised, accepted: 8 May 1998  相似文献   

循环荷载作用下SMA-PSRCW结构力学性能影响因素分析     

裴强  崔晓波  崔迪  吴聪 《地震工程与工程振动》2021,41(1):25-34

为了研究形状记忆合金(SMA)连接件对半刚接钢框架内填钢筋混凝土墙结构(PSRCW结构)受力性能的影响情况,在已有试验研究的基础上,建立了SMA-PSRCW结构的计算模型,对结构在循环荷载作用下的整体受力性能进行了数值模拟研究,考虑了配筋率、混凝土强度、内填墙厚度以及连接件布置位置和数量等因素对结构的滞回性能、骨架曲线...  相似文献   

切向流动对偏晶合金定向生长机理的影响          下载免费PDF全文

王建元  陈长乐  翟薇  金克新 《海洋学报》2010,32(10):7424-7430

研究了静态和切向流动作用下对二氯苯-丁二腈(DCB-SCN)偏晶合金的定向凝固过程.实验结果表明,静态条件下,DCB以小平面相方式生长,随着抽拉速度的提高,DCB-SCN偏晶凝固组织形貌发生液/固两相完全分离组织-规则纤维状共生组织-不规则弥散组织转变.施加切向流动作用后,DCB生长晶面出现胞状扰动,并且偏晶共生纤维间距随流速的增高而变大,但对于同一流速,仍然满足λV^0.5=常数.同时,切向流动能够细化弥散偏晶组织中第二相颗粒尺寸,这主要缘于流动引发的固液界面形态变化能  相似文献