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Vapor phase dealloying kinetics of MnZn alloys

Journal Article · · Acta Materialia
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [2];  [3];  [5];  [6]
  1. Tohoku Univ., Sendai (Japan); National Inst. of Advanced Industrial Science and Technology (AIST), Sendai (Japan); Northeastern University
  2. Tohoku Univ., Sendai (Japan)
  3. Northeastern Univ., Boston, MA (United States)
  4. Tohoku Univ., Sendai (Japan); National Inst. of Advanced Industrial Science and Technology (AIST), Sendai (Japan)
  5. Johns Hopkins Univ., Baltimore, MD (United States)
  6. Tohoku Univ., Sendai (Japan); Johns Hopkins Univ., Baltimore, MD (United States)

Vapor phase dealloying (VPD) is an environmentally-friendly method for fabricating nanoporous materials by utilizing the saturated vapor pressure difference of elements to selectively drive sublimation of one or more components from an alloy. VPD kinetics has not been explored and rate-controlling factors of the solid-gas transformation within complex nanostructure remain unknown. Using manganese-zinc alloys as a prototype system, we systematically investigated the dependence of dealloying velocity on temperature and pressure and presented a model to quantitatively describe the dealloying kinetics. Here, we found that the dealloying velocity exhibits a linear to power law transition at a critical dealloying depth, resulting from the interplay between the kinetic process of dealloying and dealloyed microstructure. This transition bridges ballistic evaporation at early time to Knudsen diffusion of Zn vapor in developed pore channels where the Zn partial pressure at the dealloying front reaches the local equilibrium between the solid and vapor phases. By comparing activation energies for VPD and bulk zinc sublimation, the entire energy landscape of VPD is measured. The fundamental understanding of VPD kinetics paves an effective way to design dealloyable precursor alloys and to optimize dealloyed microstructure of VPD materials for a wide range of applications.

Research Organization:
Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
FG02-07ER46400
OSTI ID:
1906151
Alternate ID(s):
OSTI ID: 1849759
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 212; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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