Grain refinement of Mg–10Gd alloy by Al additions

DHP-Cu has been modified with small additions of nanosized MgO particles, with and without P and B additions; and Mg, B, Ti and Al additions to investigate their effect on the grain structure under TP1 casting condition. In comparison to a reference DHP-Cu cast sample which exhibited mainly coarse columnar grains, a coarse equiaxed grain structure has been achieved with a single addition of nanosized MgO particles to a residual content of 34 ppm Mg. Whereas no grain refinement has been observed with nanosized MgO particles and P and B additions to a residual content of 109 ppm and 0.15% (nominal), respectively, and with a single addition of Mg to a residual content of 16 ppm. The combined additions of B and Ti, and B and Al to a nominal residual content slightly beyond the DHP-Cu specification have produced excessive coarsening of grains. Keywords: nanosized MgO particles; grain refinement; DHP-Cu

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The relevance of forced melt flow to grain refinement in pure aluminum under a low-frequency alternating current pulse

Journal of Materials Research ◽

10.1557/jmr.2016.17 ◽

2016 ◽

Vol 31 (3) ◽

pp. 396-404 ◽

Cited By ~ 4

Author(s):

Limin Zhang ◽

Hainan Liu ◽

Ning Li ◽

Juan Wang ◽

Rong Zhang ◽

...

Keyword(s):

Grain Refinement ◽

Current Pulse ◽

Pure Aluminum ◽

Low Frequency ◽

Alternating Current ◽

Melt Flow ◽

Image Position

Abstract

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Laser solid forming assisted by friction stir processing for preparation of Ni–16Cr–8Fe alloys: Crack repairing and grain refinement

Journal of Materials Research ◽

10.1557/jmr.2018.199 ◽

2018 ◽

Vol 33 (20) ◽

pp. 3521-3529

Author(s):

Pengda Niu ◽

Ruidi Li ◽

Tiechui Yuan ◽

Minbo Wang ◽

Siyao Xie ◽

...

Keyword(s):

Grain Refinement ◽

Friction Stir Processing ◽

Friction Stir ◽

Laser Solid Forming ◽

Image Position

Abstract

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Effect of grain refinement and phase composition on room temperature superplasticity and damping capacity of dual-phase Zn–Al alloys

Journal of Materials Research ◽

10.1557/jmr.2018.46 ◽

2018 ◽

Vol 33 (8) ◽

pp. 1032-1045 ◽

Cited By ~ 2

Author(s):

Muhammet Demirtas ◽

Kadri C. Atli ◽

Harun Yanar ◽

Gencaga Purcek

Keyword(s):

Phase Composition ◽

Grain Refinement ◽

Room Temperature ◽

Al Alloys ◽

Damping Capacity ◽

Dual Phase ◽

Image Position

Abstract

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Simple Identification of Electron Diffraction Ring Patterns

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100062713 ◽

1969 ◽

Vol 27 ◽

pp. 160-161

Author(s):

Carolyn Nohr ◽

Ann Ayres

Keyword(s):

Electron Microscope ◽

Electron Diffraction ◽

Diffraction Ring ◽

Image Position

Texts on electron diffraction recommend that the camera constant of the electron microscope be determine d by calibration with a standard crystalline specimen, using the equation

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Atomic orientation effects in proton stopping at low velocity

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100077116 ◽

1983 ◽

Vol 41 ◽

pp. 708-709

Author(s):

Kin Lam

Keyword(s):

Polycrystalline Material ◽

Charged Particles ◽

Target Material ◽

Stopping Power ◽

Low Velocity ◽

Electronic Density ◽

Interatomic Distances ◽

Frame Work ◽

Image Position ◽

Atomic Orientation

The energy of moving ions in solid is dependent on the electronic density as well as the atomic structural properties of the target material. These factors contribute to the observable effects in polycrystalline material using the scanning ion microscope. Here we outline a method to investigate the dependence of low velocity proton stopping on interatomic distances and orientations.The interaction of charged particles with atoms in the frame work of the Fermi gas model was proposed by Lindhard. For a system of atoms, the electronic Lindhard stopping power can be generalized to the formwhere the stopping power function is defined as

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