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Layer Thickness-Dependent Hardness and Strain Rate Sensitivity of Cu-Al/Al Nanostructured Multilayers

Ya-Qiang Wang , Zhao-Qi Hou , Jin-Yu Zhang , Xiao-Qing Liang , Gang Liu , Guo-Jun Zhang , Jun Sun

金属学报(英文版) doi:10.1007/s40195-016-0372-7

Cu-Al/Al nanostructured metallic multilayers with Al layer thickness h Al varying from 5 to 100 nm were prepared, and their mechanical properties and deformation behaviors were studied by nanoindentation testing. The results showed that the hardness increased drastically with dec...

关键词: Nanostructured , films , Cu-Al/Al , multilayers , Hardness , Strain , rate , sensitivity , Layer , thickness , dependence

Hardness-Lattice Parameter Correlation for Aged Al-Zn-Mg Alloys

P. Fernandez G. Gonzalez I. Alfonso I.A. Figueroa

材料科学技术(英文)

Two ternary Al-2.2Zn-0.95Mg and Al-5.5Zn-2.1Mg (in wt pct) alloys, with Zn:Mg ratios close to 2.5 were produced by conventional ingot casting metallurgy. The ingots were solution heat treated at 500°C for 0.5 h and aged at 180°C for times between 0.5 and 80 h. The structural characterization was car...

关键词: Aluminum alloy , X-ray diffraction , Precipitation , Lattice parameter , Hardness

Effects of Strain Rate and Deformation Temperature on Microstructures and Hardness in Plastically Deformed Pure Aluminum

F. Huang N.R. Tao K. Lu

材料科学技术(英文)

The microstructures and hardness of pure Al samples subjected to plastic deformation with different temperatures and strain rates were investigated. The results showed that the strain-induced grain refinement is significantly benefited by increasing strain rate and reducing deformation temperature. ...

关键词: Dynamic plastic deformation , Microstructure , Hardness , Strain rate , Temperature

On the Indeterminacy in Hardness of Shape Memory Alloys

F.T.Cheng

材料科学技术(英文)

The present communication addresses an interesting problem related to the indeterminacy in hardness of superelastic NiTi reported by Xu et al. The origin of the indeterminacy is attributed to the inadequacy of the conventional Vickers hardness testing measurement which does not record elastic deform...

关键词: Hardness , null , null , null , null , null

Effects of Strain Rate and Deformation Temperature on Microstructures and Hardness in Plastically Deformed Pure Aluminum

F. Huang N.R. Tao K. Lu

材料科学技术(英文)

The microstructures and hardness of pure Al samples subjected to plastic deformation with different temperatures and strain rates were investigated. The results showed that the strain-induced grain refinement is significantly benefited by increasing strain rate and reducing deformation temperature. ...

关键词: Dynamic plastic deformation , Microstructure , Hardness , Strain rate , Temperature

Numerical Study on the Effects of Equi-biaxial Residual Stress on Mechanical Properties of Nickel Film by Means of Nanoindentation

Lizeng Ling Shiguo Long Zengsheng Ma Xu Liang

材料科学技术(英文)

In this paper, mechanical properties of Nickel film under residual stress have been systematically examined by finite element method in nanoindentation. It was found that load-displacement curves shifted under elastic residual stress and residual stress exceeded the yield stress for fixed indentatio...

关键词: Residual stress , Hardness , Elastic Modulus , Indentation profile , Finite element method

Influence of Re on the Properties of a NiCoCrAlY Coating Alloy

J.J. Liang

材料科学技术(英文)

MCrAlY can serve as stand-alone overlay coatings or bond coats in thermal barrier coating systems, and its properties play a vital role in determining the performance of these coating systems. In order to further understand the behavior of MCrAlY coatings, several NiCoCrAlY model alloys with differe...

关键词: NiCoCrAlY

Mechanical and Wear Properties of Nanostructured Surface Layer in Iron Induced by Surface Mechanical Attrition Treatment

Nairong TAO , Weiping TONG , Zhenbo WANG , Wei WANG , Manling SUI , Jian LV , Ke LU

材料科学技术(英文)

A porosity-free and contamination-free surface layer with grain sizes ranging from nanometer to micrometer in Fe samples was obtained by surface mechanical attrition treatment (SMAT) technique. Mechanical and wear properties of the surface layer in the SMATed and annealed Fe samples were measured by...

关键词: Nanocrystallites , null , null , null , null

Glass ceramic of high hardness and fracture toughness developed from iron-rich wastes

Weixin HAN

金属学报(英文版) doi:10.1016/S1006-7191(08)60087-3

A study has been carried out on the feasibility of using high iron content wastes, generated during steel making, as a raw material for the production of glass ceramic. The iron-rich wastes were mixed and melted in different proportions with soda-lime glass cullet and sand. The devitrification of th...

关键词: Iron-rich wastes , null , null , null

Precipitation Study in Inconel 625 Alloy by Positron Annihilation Spectroscopy

M.Ahmad , W.Ahmad , M.A.Shaikh , Mahmud Ahmad , M.U.Rajput

材料科学技术(英文)

Precipitation in Inconel 625 alloy has been studied by positron annihilation spectroscopy and electron microscopy. The observed dependence of annihilation characteristics on aging time is attributed to the change of the positron state due to the increase and decrease of the density and size of the γ...

关键词: Positron lifetime , null , null , null , null

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