材料期刊网

A Concordant Shift Model for Flow in Bulk Metallic Glasses

Gang Wang , Zbigniew H. Stachurski

金属学报(英文版) doi:10.1007/s40195-016-0369-2

The homogeneous plastic flow in bulk metallic glasses (BMGs) must be elucidated by an appropriate atomistic mechanism. It is proposed that a so-called concordant shifting model, based on rearrangements of five-atom subclusters, can describe the plastic strain behaviour of BMGs in a temperature range...

关键词: Bulk , metallic , glasses , Superplasticity , Vacancy/atom , exchange , model , Atomic , concordant , shifting , model , Strain , rate

Investigation of Subboundaries Evolution in Superplastically Deformed NiAl by Positron Lifetime

Xinghao DU , Jianting GUO , Bide ZHOU , Liangyue XIONG

材料科学技术（英文）

In order to study the subboundaries evolution in superplastically deformed NiAl, the positron lifetime change during superplastic deformation process was measured. It is shown that the superplastic deformation of NiAl has not influence on its τ2, the newly recrystallized grain boundaries formed duri...

关键词: NiAl , null , null , null

Synthesis and Enhanced Superplasticity of the Zirconia-dispersed Alumina Nanocomposite

Guoqing CHEN , Kaifeng ZHANG , Wenbo HAN , Junting LUO

材料科学技术（英文）

A series of alumina-zirconia composites with various grain sizes were prepared from the nano-sized powders with different agglomerations. Microstructural analysis of the sintered compacts indicates that the as-sintered material is a typical intra/inter granular nanocomposite with uniform distributio...

关键词: Nanocomposite , null , null , null

Cavitation Behavior during Superplastic Deformation of AZ31 Magnesium Alloy

Kaifeng ZHANG , Deliang YIN , Guofeng WANG , Wenbo HAN

材料科学技术（英文）

Superplasticity of AZ31 Mg alloy at the temperature range of 250~450℃ and stain rate range of 0.7×10-3~1.4×10-1 s-1 was examined through uniaxial tensile test. Optical microscopy (OM) and scanning electron microscopy (SEM) were employed to investigate the morphology of cavities and surface relief ne...

关键词: AZ31 magnesium alloy , null , null , null

Superplasticity Enhanced by Two-stage Deformation in a Hot-extruded AZ61 Magnesium Alloy

Yinong WANG , J.C.Huang

材料科学技术（英文）

A two-stage strain rate deformation method is proposed to enhance the superplasticity in a hot extruded AZ61 alloy. In the stage-one of deformation, a relatively high strain rate was applied in order to obtain fine grains through dynamic recrystallization. The optimum strain rate for DRX at 300℃ was...

关键词: AZ61 magnesium alloy , null , null , null

材料参数对拉伸失稳影响的力学解析

宋玉泉 , 索忠林 , 管志平 , 刘颖

金属学报

超塑性变形的失稳比塑性变形失稳复杂得多,国内外学者在失稳的力学研究方面已发表了许多有价值的论文,对超塑性研究的进展贡献很大.由于不同学者的研究思路和研究方法不同,所得的结论也各异,因此有必要进行理论规范.本文从变形的状态方程出发,对无几何缺陷试样在恒温条件下仅由材料本身所产生的拉伸失稳,进行力学理论...

关键词: 超塑性 , specimen without geometric defect , constant temperature , tensile instability criterion

Superplasticity of a SiCw/Zn-22Al Composites

材料科学技术（英文）

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High Strain Rate Superplasticity in a Micro-grained A1-Mg-Sc Alloy with Predominant High Angle Grain Boundaries

材料科学技术（英文）

关键词: 高应变速率超塑性 , 晶界滑移 , 铝合金 , 大角度 , 微细粒 , 超塑性变形 , 电子背散射衍射 , 随机取向

Investigation on Superplasticity in SiCp/2024 Cold Rolling Sheet after Heat Treatment

材料科学技术（英文）

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High Temperature Creep and Superplasticity in a Mg-Zn-Zr Alloy

材料科学技术（英文）

关键词: 超塑性行为 , 高温蠕变 , 镁合金 , 锆合金 , 温度范围 , 高应变率 , 测试调查 , 晶界滑移