Mesoscale structure and segregation in electrodeposited nanocrystalline alloys

Ruan, Shiyun; Schuh, Christopher A.

doi:10.1016/j.scriptamat.2008.08.010

Cited by 53 publications

(26 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…16 SEM micrographs of the Ni-P/Ni-B-W coatings before and after the heat treatments showed the formation of typical spherical nodular structures (Figure 2). Each nodule appears to be formed by the unification of many grains existing as colonies (Figure 2b), similar to the case suggested by S. Ruan et al 17 Some microcracks were noticeable on the surfaces of the as-plated Ni-P/Ni-B-W samples. The microcracks may be due to the internal stress caused by the relatively larger tungsten atoms in the coating structure.…”

Section: Discussionsupporting

confidence: 84%

See 1 more Smart Citation

Corrosion resistance of as-plated and heat-treated electroless dublex Ni-P/Ni-B-W coatings

Yüksel¹,

Erdoğan²,

Baştan³

et al. 2017

Mater. Tehnol.

View full text Add to dashboard Cite

In this study, Ni-P/Ni-B-W dublex coatings were deposited on carbon steel substrates (AISI 1020) using the electroless plating process and their microstructure and corrosion properties were systematically evaluated based on different heat-treatment temperatures. Both, the surface morphology and cross-sectional morphology of the Ni-P/Ni-B-W coatings were studied using a scanning electron microscope (SEM), while X-ray diffraction (XRD) was applied for examining the structural modifications. The amorphous coating began to crystallize at a heat-treatment temperature of 350°C. Potentiodynamic polarization measurements were carried out in an aqueous medium containing 3.5 % NaCl for evaluating the corrosion resistance of as-plated and heat-treated dublex coatings. The corrosion potentials of dublex coatings were observed to shift toward more positive values with increased heat-treatment temperatures. Depending on the heat-treatment temperature, it was identified that the crystallized dublex coatings generally had better corrosion resistance than the amorphous coating. Keywords: Ni-P/Ni-B-W coating, corrosion, heat treatment V {tudiji so bile dvojne Ni-P/Ni-B-W prevleke nane{ene na substrate iz ogljikovega jekla (AISI 1020) s postopkom neelektri~nega platiranja. Sistemati~no so bile ocenjene mikrostruktura ter korozijske lastnosti izdelanih prevlek, glede na razli~ne temperature toplotne obdelave. Morfologije povr{in in profili izdelanih Ni-P/Ni-B-W prevlek so bili pregledani z vrsti~nim elektronskim mikroskopom (SEM), medtem ko so bile z rentgensko difrakcijsko analizo (XRD) ugotovljene strukturne spremembe. Amorfna prevleka je za~ela kristalizirati pri temperaturi toplotne obdelave 350°C. Korozijska odpornost platiranih in toplotno obdelanih dupleks prevlek je bila ocenjena s pomo~jo meritev potenciodinami~ne polarizacije v 3,5 % vodni raztopini NaCl. Opazovali so korozijske potenciale dupleks prevlek, da bi dobili bolj pozitivne vrednosti z zvi{animi temperaturami topolotne obdelave. Ugotovljeno je bilo, da imajo kristalizirane dupleks prevleke na splo{no bolj{o korozijsko odpornost kot amorfne prevleke.

show abstract

Section: Discussionsupporting

confidence: 84%

“…In a Ni-B-W coating system, W atoms may selectively exist at the boundaries of the nodules, from there, they may segregates to the coating surface, during the heat treatments. 16,17 This process may decrease the internal stress inside the coating, resulting in a substantial decrease of the microcracks on the coating surface.…”

Section: Discussionmentioning

confidence: 99%

Corrosion resistance of as-plated and heat-treated electroless dublex Ni-P/Ni-B-W coatings

Yüksel¹,

Erdoğan²,

Baştan³

et al. 2017

Mater. Tehnol.

View full text Add to dashboard Cite

show abstract

“…28,3840) It is not clear whether the meso-scale structures have an effect on the ductility and fracture surfaces of electrodeposited metals. The meso-scale structural evolution of bulk nanocrystalline NiW alloys with different initial-crystal orientation was studied by SIM, shown in Figs.…”

Section: Meso-scale Structure Observationmentioning

confidence: 99%

“…Amblard et al 26) have reported that the orientation of electrodeposited Ni strongly depends on the growth modes during an electrodeposition. Furthermore, electrodeposited metals have mesoscale structures 27,28) which are orders of magnitude larger than the nano-scale grains, and these structures may change depending on the growth mode. 26) However, there has been little study on the effect growth mode on tensile ductility of electrodeposited bulk nanocrystalline metals.…”

Section: Introductionmentioning

confidence: 99%

Strategy for Electrodeposition of Highly Ductile Bulk Nanocrystalline Metals with a Face-Centered Cubic Structure

et al. 2014

View full text Add to dashboard Cite

A strategy for producing highly ductile electrodeposited bulk nanocrystalline metals with face-centered cubic structures was developed in a NiW alloy model system. Bulk nanocrystalline NiW alloys with similar grain size (2030 nm), and varying crystallographic orientations were produced. The electrodeposited alloys showed tensile elongation ranging between 0 and 13%. Scanning ion microscopy reveled that all electrodeposited alloys had similar meso-scale structures that are typical of electrodeposited metals. This indicated the variation of ductility and fracture surfaces was not caused by cluster structures filled with nano-grains. The tensile behavior of the bulk nanocrystalline NiW alloys could be explained by considering the effects of growth processes during electrodeposition on the presence of hydrogen and defects. Our discussion surrounding NiW alloys outlines the conditions necessary to obtain the high tensile ductility. Our findings are in good agreement with those for other electrodeposited nanocrystalline face-centered cubic metals. We also provide guidelines for selecting electrodeposition conditions to produce bulk nanocrystalline metals with face-centered cubic structures and high tensile ductility.

show abstract

“…[2] It has been frequently observed that electrodeposits exhibit a nodular surface morphology with a size scale that can be several orders of magnitude greater than the grain size. [3,4] It has been postulated that each nodule represents a ''colony'' of nanosized grains, as schematically shown in Figure 1, and that these grain colonies form and grow competitively during deposition. [4] Although properties such as yield strength and hardness of electrodeposited nanocrystalline alloys may be primarily dictated by grain size, it can be expected that many other properties, such as corrosion resistance, toughness or ductility, coefficient of friction, and wear resistance, will be affected by the characteristics of the mesoscale colonies.…”

Section: Introductionmentioning

confidence: 99%

Microscale and Mesoscale Crystallographic Textures of Nanocrystalline Ni-Based Electrodeposits

Čížek

Barnett

Nave

et al. 2010

Metall Mater Trans A

View full text Add to dashboard Cite

International audienceThe microscale and mesoscale crystallographic textures observed in nanocrystalline Ni, Ni-20 pct Fe, and Ni-50 pct Fe electrodeposits are described. The nanosized grains are arranged in coarse mesoscale colonies. In the as-deposited state, the bulk texture of the Ni-20 pct Fe alloy displays a dominant aOE (c) 001 > fiber parallel to the macroscopic deposition direction (DD). The grains are elongated along the aOE (c) 001 > crystal lattice direction, which is mostly parallel to the local DD, producing a well-defined aOE (c) 001 >//DD fiber microtexture on a local scale. The grain misorientation histograms show some content of low-angle boundaries, frequently associated with the presence of grain clusters, and are dominated by high-angle boundaries with a possible enhanced frequency of a5 and a7 coincident site lattice boundaries and a significant content of a3 twin boundaries. For all three alloys, the coarsened grains, obtained by annealing, within the mesoscale colonies show a fiber mesotexture characterized by a aOE (c) 111 > axis approximately perpendicular to the colony hemispherical growth surface (parallel to the local DD). It is surmised that a similar "cobblestone" mesotexture with a aOE (c) 001 > fiber axis already exists in the as-received state, as previously proposed by a number of the present authors and as supported by the results on the Ni-20 pct Fe alloy presented her

show abstract

Mesoscale structure and segregation in electrodeposited nanocrystalline alloys

Cited by 53 publications

References 24 publications

Corrosion resistance of as-plated and heat-treated electroless dublex Ni-P/Ni-B-W coatings

Corrosion resistance of as-plated and heat-treated electroless dublex Ni-P/Ni-B-W coatings

Strategy for Electrodeposition of Highly Ductile Bulk Nanocrystalline Metals with a Face-Centered Cubic Structure

Microscale and Mesoscale Crystallographic Textures of Nanocrystalline Ni-Based Electrodeposits

Contact Info

Product

Resources

About