Jun SHEN
,
Zhuangde XIE
,
Bide ZHOU
,
Qingchun LI
,
Zhijun SU
,
Hongsheng LE
材料科学技术（英）
A hypereutectic Al-Si alloy powder was prepared by ultrasonic gas atomization process. The morphologies, microstructure and phase constituent of the alloy powder were studied. The results showed that powder of the alloy was very fine and its microstructure was mainly consisted of Si crystals plus intermetallic compound A19FeSi3, which were very fine and uniformly distributed.
关键词:
Hakan Colak
材料科学技术（英）
This paper reported the synthesis, crystal structure and electrical conductivity properties of Ni-doped ZnO powders (i.e. Zn1-XNiXObinary system, X=0, 0.0025, 0.005, 0.0075 and in the range 0.01≤X≤0.15). I-phase samples, which were indexed as single phase with a hexagonal (wurtzite) structure in the Zn1-XNiXObinary system, were determined by X-ray diffraction (XRD). The widest range of the I-phase was determined as 0≤X≤0.03 at 1200°C; above this range the mixed phase was observed. The impurity phase was determined as NiO when compared with standard XRD data, using the PDF program. We focused on single I-phase ZnO samples which were synthesized at 1200°C because of the widest range of solubility limit at this temperature. It was observed that the lattice parameters a and c of the I-phase decreased with Ni doping concentration. The morphology of the I-phase samples was analyzed with a scanning electron microscope. The electrical conductivity of the pure ZnO and single I-phase samples were studied by using the four-probe dc method at temperatures between 100 and 950°C in air atmosphere. The electrical conductivity values of pure ZnO and 3 mol% Ni-doped ZnO samples at 100°C were 2×10-6 and 4.8×10-6Ω-1?cm-1, and at 950°C they were 1.8 and 3.6Ω-1?cm-1, respectively. In other words, electrical conductivity increased with Ni doping concentration.
关键词:
II-VI semiconductors
Journal of Materials Science
In this paper, Portevin-Le Chatelier (PLC) effect of LA41 magnesium alloy is reported. With increasing strain rate, both ultimate tensile stresses (sigma(b)) and 0.2% proof (sigma(0.2)) stresses increase, while serrations become less severe. Major acoustic emission (AE) peaks appear at the end of elastic region, and transform to burst type signals in the plastic range. In another alloy containing less Li (LA11), serrations are absent and major AE peak values are considerably lowered. Additionally, PLC effect disappears in LA41 after annealing. The role of twins is discussed in details. Actual causes for AE activity during deformation are also proposed.
关键词:
tensile deformation;magnesium alloys;bands;az31
Yongli Huang
材料科学技术（英）
The reverse analysis provides a convenient method to determine four elastic-plastic parameters through an indentation curve such as Young's modulus E, hardness H, yield strength σy and strain hardening exponent n. In this paper, mathematical analysis on a reverse algorithm from Dao model (Dao et al., Acta Mater., 2001, 49, 3899) was carried out, which thought that only when 20≤E*/σ0:033≤26and 0.3<n≤0.5, the reverse algorithm would yield two solutions of n by dimensionless function Π2. It is shown that, however, there are also two solutions of n when 20≤E*/σ0:033≤26 and 0≤n<0.1. A unique n can be obtained by dimensionless function Π3 instead of Π2 in these two ranges. E and H can be uniquely determined by a full indentation curve, and σy can be determined if n is unique. Furthermore, sensitivity analysis on obtaining n from dimensionless function Π3 or Π22 has been made.
关键词:
Elastic-plastic properties
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null
,
null
,
null
,
null
Yongli Huang
材料科学技术（英）
The reverse analysis provides a convenient method to determine four elastic-plastic parameters through an indentation curve such as Young's modulus E, hardness H, yield strength σy and strain hardening exponent n. In this paper, mathematical analysis on a reverse algorithm from Dao model (Dao et al., Acta Mater., 2001, 49, 3899) was carried out, which thought that only when 20≤E*/σ0:033≤26and 0.3<n≤0.5, the reverse algorithm would yield two solutions of n by dimensionless function Π2. It is shown that, however, there are also two solutions of n when 20≤E*/σ0:033≤26 and 0≤n<0.1. A unique n can be obtained by dimensionless function Π3 instead of Π2 in these two ranges. E and H can be uniquely determined by a full indentation curve, and σy can be determined if n is unique. Furthermore, sensitivity analysis on obtaining n from dimensionless function Π3 or Π22 has been made.
关键词:
Elastic-plastic properties
,
null
,
null
,
null
,
null
宋开新
,
杨岳强
,
郑鹏
,
徐军明
,
秦会斌
无机材料学报
doi:10.3724/SP.J.1077.2012.00575
采用固相烧结反应法制备(Mg1-xSrx)2Al4Si5O18陶瓷. Sr掺杂促进低温相β-Mg2Al4Si5O18向高温相α-Mg2Al4Si5O18转变, 并拓宽了(Mg1-xSrx)2Al4Si5O18陶瓷的致密化烧结温度范围. X射线衍射结果表明在0≤x＜0.2范围内, (Mg1-xSrx)2Al4Si5O18陶瓷以(Mg,Sr)2Al4Si5O18堇青石固溶体形式存在; 在0.6＜x≤1.0范围内, 以(Sr, Mg)Al2Si2O8固溶体存在. 用扫描电子显微镜观察表明Sr掺杂可以有效地降低Mg2Al4Si5O18陶瓷的气孔率与微裂纹, 促进SrAl2Si2O8锶长石晶粒生长与均匀分布. 在0≤x≤0.4范围内, (Mg1-xSrx)2Al4Si5O18陶瓷介电常数基本保持在7.0左右. 在0.6≤x≤1.0范围内从7.0增加到8.5. Qf值在0≤x≤0.2范围内从24100 GHz显著地提高到 38900 GHz, 然后逐渐降低至SrAl2Si2O8的14500 GHz.
关键词:
Mg2Al4Si5O18; SrAl2Si2O8; 微波性能
王书晗刘振宇张维娜王国栋
金属学报
通过控温拉伸实验分析了在298, 373, 473和673 K温度下变形时, TWIP钢(Fe--25Mn--3Si--3Al)力学性能和显微组织的变化规律. 结果表明, TWIP钢的强度和延伸率均随温度的升高而降低. 通过热力学公式对不同温度下TWIP钢层错能$\it\Gamma$的估算可以推断, 温度T≥673 K时, Γ≥76 mJ/m2, 滑移为TWIP钢主要的变形机制; 298 K≤ T≤373 K时, 21 mJ/m2≤Γ≤34 mJ/m2, 孪生为TWIP钢主要的变形方式, 此时产生“TWIP”效应, 可获得较高的加工硬化速率, 从而获得高强度及高塑性.
关键词:
形变孪晶
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high temperature deformation
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deformation mechanism
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stacking fault energy
石科峰
,
卢文强
工程热物理学报
本文采用有限单元法求解涡量、流函数、能量和组分控制方程,数值模拟了在温度梯度和浓度梯度正交情况下竖直环形容器内的双扩散对流结构.通过改变浮升力比N=GrS/GrT和Le数的大小,分析了溶质浮升力方向及其大小和Le数对容器内双扩散对流的影响.结果表明:当溶质浮升力改变时,壁面处的流体流动状况、边界层厚度、Nu数和Sh数都发生了变化;随着Le数的增大,竖直壁面处Nu数逐渐降低而水平壁面处的Sh数逐渐增大.
关键词:
边界层
,
双扩散对流
,
有限单元法
