Zhiqiang YU
,
Gaohui WU
,
Longtao JIANG
,
Dongli SUN
材料科学技术（英文）
The liquid-phase coating method was used to deposit Y2O3 ceramic on the surface of α-Al¬2O3. The coated-Al2O3p/6061Al composites were produced using squeeze casting technology. The microstructure and tensile properties of the composites were analysed and studied. The results showed that the coated Al2O3 particles are able to disperse homogeneously in the aluminum liquid. The microstructure of the composites is more even in comparison with that of as-received powders. The tensile testing indicated that mechanical properties of the coated-Al2O3p/6061Al composites are better than those of uncoated particles. In the composite with 30% volume fraction, the tensile strength, yield strength as well as elongation is increased by 29.8%, 38.4% and 10.3%, respectively. The SEM analysis of fracture indicated that the dimples of the coated-Al2O3p /6061Al composites are more even.
关键词:
Submicron alumina powders
,
null
,
null
Longtao JIANG
,
Dongli SUN
,
Gaohui WU
,
Qiang ZHANG
,
Jianfeng CHEN
,
Norio KOUNO
材料科学技术（英文）
The microstructural characteristic of 1070Al matrix composites reinforced by 0.15µm Al2O3 particles whose volume fraction was 40% was investigated by TEM and HREM. The results showed that the interface between the matrix and reinforcements was clean and bonded well, without any interfacial reaction products. There were some preferential crystallographic orientation relationships between Al matrix and Al2O3 particle because of the lattice imperfection on the surface of Al2O3 particles.
关键词:
Al2O3p/Al composite
,
null
,
null
Qiang ZHANG
,
Gaohui WU
,
Dongli SUN
,
Bofeng LUAN
材料科学技术（英文）
The AlN particle reinforced aluminum matrix composites with 50% volume fraction were fabricated by squeeze-casting technology. The thermal expansion behavior and its response to thermal cycling were studied between 20℃ and 400℃. Compared with four theoretical models, the measured CTEs of the composite lie within the elastic bounds derived by Schapery's analysis. Schapery's model and Kerner's model agree well with the CTEs of the composites at lower temperature and elevated temperature, respectively. Strain hysteresis was observed between heating and cooling curves during cycling. This was attributed primarily to the anelastic behavior of the matrix induced by matrix residual stresses.
关键词:
AlN
,
null
,
null
,
null
周镇
,
艾育华
,
孔文俊
工程热物理学报
本文利用双腔泄压式定压燃烧弹,研究了高压下典型IGCC合成气的层流火焰传播特性,得到了不同压力(0.1～1 MPa)和不同当量比下(0.6～3.0)合成气的层流火焰传播速度和Markstein长度.实验结果表明,层流火焰传播速度随当量比先增加后减少,随压力的增加而减小.Davis和Sun机理能较好地预测高压下合成气层流火焰的传播速度.Markstein长度随当量比的增加而增加,随压力的增加而减小.
关键词:
合成气
,
球形火焰
,
层流火焰传播速度
,
Markstein长度
程杰锋
,
唐广波
,
刘正东
钢铁研究学报
选取了现有典型的C-Mn钢相变过程的物理冶金模型,包括5组孕育期模型、7组相变动力学方程模型、5组相变后铁素体晶粒尺寸模型.利用自行开发的组织性能预报系统软件模拟计算了在3组实际冷却工艺条件下各模型的奥氏体转变过程,并对各模型进行了评价.结果表明,对于所设定的成分和工艺条件,适用性较好的孕育期模型是Kwon所提出的模型;适用性较好的动力学方程模型是Liu、Donnay和Sun所提出的模型;适用性较好的铁索体晶粒尺寸模型是Hodgson所提出的模型.
关键词:
孕育期
,
相变
,
适用性分析
朱亮
,
肖毅
复合材料学报
为满足在工程应用中对建立拉压性能不同纤维增强复合材料的非线性本构理论的需要,考虑静水压影响的Drucker-Prager屈服准则与各向异性的Hill屈服准则相结合,提出了广义Hill屈服准则,并推广到Sun-Chen的单参数塑性模型中,建立了考虑拉压异性复合材料的非线性统一本构方程.实验验证结果表明,运用本文中所建立的本构模型能够很好地描述碳纤维/环氧(IM600/Q133)复合材料在偏轴拉伸和压缩载荷作用下的非线性响应.
关键词:
单向复合材料
,
非线性响应
,
不同屈服强度
,
本构方程
,
偏轴拉伸-压缩载荷
郝寅雷
无机材料学报
doi:10.3321/j.issn:1000-324X.2003.02.007
建立在均匀、无应力状态基础上的玻璃性质计算模型,在用于离子交换法制备的GRIN光学元件的折射率变化值(ΔN)计算时与实验结果有一定的偏差.本文对HSD(Higgins,Sun和Davis)模型和干福熹模型进行了比较,结果表明,干福熹模型用于低应力光学元件的计算时计算结果与实验值偏差较小,但对高应力GRIN光学元件的ΔN计算偏差很大;HSD模型在计算过程中分别考虑了玻璃组分的极化率因素和体积因素对其折射率的影响,在用于高应力GRIN光学元件ΔN计算时具有更强的适用性.
关键词:
梯度折射率
,
离子交换
,
玻璃
,
模型
洪慧玲
,
袁帅
,
吕珂臻
,
唐红
,
豆育升
材料导报
doi:10.11896/j.issn.1005-023X.2016.02.033
利用COMPASS力场,在不同压力和温度条件下对PBX-9501粘结剂体系进行了分子动力学模拟和静态力学分析.通过研究PBX-9501粘结剂的压缩行为,获得该材料在600 K/700 K下的等温压缩线,并采用不同状态方程对结果进行拟合处理,确定方程中的参数.模拟结果表明经典Tait和Sun状态方程适用于描述PBX-9501粘结剂的等温压缩行为.通过静态力学分析,得到体系各模量和弹性系数随温度的变化,分析发现随着温度升高,材料的刚性减弱,弹性增强.
关键词:
分子动力学模拟
,
粘结剂
,
弹性性能
,
状态方程
