Interdiffusion and impurity diffusion in polycrystalline Mg solid solution with Al or Zn

C. C. Kammerer; N. S. Kulkarni; R. J. Warmack; Y. H. Sohn

doi:10.1016/j.jallcom.2014.07.193

Interdiffusion and impurity diffusion in polycrystalline Mg solid solution with Al or Zn

C. C. Kammerer, N. S. Kulkarni, R. J. Warmack, Y. H. Sohn

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Abstract

Interdiffusion and impurity diffusion in Mg binary solid solutions, Mg(Al) and Mg(Zn) were investigated at temperatures ranging from 623 to 723 K. Interdiffusion coefficients were determined via the Boltzmann-Matano Method using solid-to-solid diffusion couples assembled with polycrystalline Mg and Mg(Al) or Mg(Zn) solid solutions. In addition, the Hall method was employed to extrapolate the impurity diffusion coefficients of Al and Zn in pure polycrystalline Mg. For all diffusion couples, electron microprobe analysis was utilized for the measurement of concentration profiles. The interdiffusion coefficient in Mg(Zn) was higher than that of Mg(Al) by an order of magnitude. Additionally, the interdiffusion coefficient increased significantly as a function of Al content in Mg(Al) solid solution, but very little with Zn content in Mg(Zn) solid solution. The activation energy and pre-exponential factor for the average effective interdiffusion coefficient in Mg(Al) solid solution were determined to be 186.8 (±0.9) kJ/mol and 7.69 × 10^-1(±1.80 × 10^-1) m²/s, respectively, while those determined for Mg(Zn) solid solution were 139.5 (±4.0) kJ/mol and 1.48 × 10^-3(±1.13 × 10^-3) m²/s. In Mg, the Zn impurity diffusion coefficient was an order of magnitude higher than the Al impurity diffusion coefficient. The activation energy and pre-exponential factor for diffusion of Al impurity in Mg were determined to be 139.3 (±14.8) kJ/mol and 6.25 × 10^-5(±5.37 × 10^-4) m²/s, respectively, while those for diffusion of Zn impurity in Mg were determined to be 118.6 (±6.3) kJ/mol and 2.90 × 10^-5(±4.41 × 10^-5) m²/s.

Original language	English
Pages (from-to)	968-974
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	617
DOIs	https://doi.org/10.1016/j.jallcom.2014.07.193
State	Published - Dec 25 2014
Externally published	Yes

Funding

This research was sponsored by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy (EERE), Office of Vehicle Technologies , as part of the Automotive Lightweight Materials Program under contract DE-AC05-00OR22725 with UT-Battelle, LLC. Authors also appreciate Dr. Kelly Perry of the High Temperature Materials Laboratory (HTML) at Oak Ridge National Laboratory for assistance with the EPMA measurements.

Keywords

Alloy
Diffusion
Electron probe
Magnesium
Microanalysis
Solid solution

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10.1016/j.jallcom.2014.07.193

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title = "Interdiffusion and impurity diffusion in polycrystalline Mg solid solution with Al or Zn",

abstract = "Interdiffusion and impurity diffusion in Mg binary solid solutions, Mg(Al) and Mg(Zn) were investigated at temperatures ranging from 623 to 723 K. Interdiffusion coefficients were determined via the Boltzmann-Matano Method using solid-to-solid diffusion couples assembled with polycrystalline Mg and Mg(Al) or Mg(Zn) solid solutions. In addition, the Hall method was employed to extrapolate the impurity diffusion coefficients of Al and Zn in pure polycrystalline Mg. For all diffusion couples, electron microprobe analysis was utilized for the measurement of concentration profiles. The interdiffusion coefficient in Mg(Zn) was higher than that of Mg(Al) by an order of magnitude. Additionally, the interdiffusion coefficient increased significantly as a function of Al content in Mg(Al) solid solution, but very little with Zn content in Mg(Zn) solid solution. The activation energy and pre-exponential factor for the average effective interdiffusion coefficient in Mg(Al) solid solution were determined to be 186.8 (±0.9) kJ/mol and 7.69 × 10-1(±1.80 × 10-1) m2/s, respectively, while those determined for Mg(Zn) solid solution were 139.5 (±4.0) kJ/mol and 1.48 × 10-3(±1.13 × 10-3) m2/s. In Mg, the Zn impurity diffusion coefficient was an order of magnitude higher than the Al impurity diffusion coefficient. The activation energy and pre-exponential factor for diffusion of Al impurity in Mg were determined to be 139.3 (±14.8) kJ/mol and 6.25 × 10-5(±5.37 × 10-4) m2/s, respectively, while those for diffusion of Zn impurity in Mg were determined to be 118.6 (±6.3) kJ/mol and 2.90 × 10-5(±4.41 × 10-5) m2/s.",

keywords = "Alloy, Diffusion, Electron probe, Magnesium, Microanalysis, Solid solution",

author = "Kammerer, {C. C.} and Kulkarni, {N. S.} and Warmack, {R. J.} and Sohn, {Y. H.}",

year = "2014",

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doi = "10.1016/j.jallcom.2014.07.193",

language = "English",

volume = "617",

pages = "968--974",

journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Interdiffusion and impurity diffusion in polycrystalline Mg solid solution with Al or Zn

AU - Kammerer, C. C.

AU - Kulkarni, N. S.

AU - Warmack, R. J.

AU - Sohn, Y. H.

PY - 2014/12/25

Y1 - 2014/12/25

N2 - Interdiffusion and impurity diffusion in Mg binary solid solutions, Mg(Al) and Mg(Zn) were investigated at temperatures ranging from 623 to 723 K. Interdiffusion coefficients were determined via the Boltzmann-Matano Method using solid-to-solid diffusion couples assembled with polycrystalline Mg and Mg(Al) or Mg(Zn) solid solutions. In addition, the Hall method was employed to extrapolate the impurity diffusion coefficients of Al and Zn in pure polycrystalline Mg. For all diffusion couples, electron microprobe analysis was utilized for the measurement of concentration profiles. The interdiffusion coefficient in Mg(Zn) was higher than that of Mg(Al) by an order of magnitude. Additionally, the interdiffusion coefficient increased significantly as a function of Al content in Mg(Al) solid solution, but very little with Zn content in Mg(Zn) solid solution. The activation energy and pre-exponential factor for the average effective interdiffusion coefficient in Mg(Al) solid solution were determined to be 186.8 (±0.9) kJ/mol and 7.69 × 10-1(±1.80 × 10-1) m2/s, respectively, while those determined for Mg(Zn) solid solution were 139.5 (±4.0) kJ/mol and 1.48 × 10-3(±1.13 × 10-3) m2/s. In Mg, the Zn impurity diffusion coefficient was an order of magnitude higher than the Al impurity diffusion coefficient. The activation energy and pre-exponential factor for diffusion of Al impurity in Mg were determined to be 139.3 (±14.8) kJ/mol and 6.25 × 10-5(±5.37 × 10-4) m2/s, respectively, while those for diffusion of Zn impurity in Mg were determined to be 118.6 (±6.3) kJ/mol and 2.90 × 10-5(±4.41 × 10-5) m2/s.

AB - Interdiffusion and impurity diffusion in Mg binary solid solutions, Mg(Al) and Mg(Zn) were investigated at temperatures ranging from 623 to 723 K. Interdiffusion coefficients were determined via the Boltzmann-Matano Method using solid-to-solid diffusion couples assembled with polycrystalline Mg and Mg(Al) or Mg(Zn) solid solutions. In addition, the Hall method was employed to extrapolate the impurity diffusion coefficients of Al and Zn in pure polycrystalline Mg. For all diffusion couples, electron microprobe analysis was utilized for the measurement of concentration profiles. The interdiffusion coefficient in Mg(Zn) was higher than that of Mg(Al) by an order of magnitude. Additionally, the interdiffusion coefficient increased significantly as a function of Al content in Mg(Al) solid solution, but very little with Zn content in Mg(Zn) solid solution. The activation energy and pre-exponential factor for the average effective interdiffusion coefficient in Mg(Al) solid solution were determined to be 186.8 (±0.9) kJ/mol and 7.69 × 10-1(±1.80 × 10-1) m2/s, respectively, while those determined for Mg(Zn) solid solution were 139.5 (±4.0) kJ/mol and 1.48 × 10-3(±1.13 × 10-3) m2/s. In Mg, the Zn impurity diffusion coefficient was an order of magnitude higher than the Al impurity diffusion coefficient. The activation energy and pre-exponential factor for diffusion of Al impurity in Mg were determined to be 139.3 (±14.8) kJ/mol and 6.25 × 10-5(±5.37 × 10-4) m2/s, respectively, while those for diffusion of Zn impurity in Mg were determined to be 118.6 (±6.3) kJ/mol and 2.90 × 10-5(±4.41 × 10-5) m2/s.

KW - Alloy

KW - Diffusion

KW - Electron probe

KW - Magnesium

KW - Microanalysis

KW - Solid solution

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DO - 10.1016/j.jallcom.2014.07.193

M3 - Article

AN - SCOPUS:84922228057

SN - 0925-8388

VL - 617

SP - 968

EP - 974

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Interdiffusion and impurity diffusion in polycrystalline Mg solid solution with Al or Zn

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