Surface alloying of AZ91E alloy by Al–Zn packed powder diffusion coating

Hirmke, J.; Zhang, Mingxing; StJohn, David H.

doi:10.1016/j.surfcoat.2011.07.050

Cited by 50 publications

(22 citation statements)

References 25 publications

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“…The temperature of 413 °C was selected because this temperature is typical for solid solution heat treatment for AZ91, and the maximum Al concentration could be obtained in the Mg solid solution without melting due to eutectic formation. Previous study [5] had found that the Mg-Al intermetallic coating produced by the PPDC process at 413 °C had the best corrosion resistance. After the PPDC treatment, the specimens were cross-sectioned, mounted in resin and ground and polished.…”

Section: Methodsmentioning

confidence: 92%

“…The container was filled about two thirds with the Mg alloy specimens in the Al and Zn powder mixture, topped up with sand, on which was placed a mixture of sand and charcoal to reduce oxidation of the specimens. The PPDC treatment was carried at 413 °C for 18 hours followed by air cooling to room temperature [5,19]. The temperature of 413 °C was selected because this temperature is typical for solid solution heat treatment for AZ91, and the maximum Al concentration could be obtained in the Mg solid solution without melting due to eutectic formation.…”

Section: Methodsmentioning

confidence: 99%

“…Aluminizing via diffusion coating is a promising approach to improve wear and corrosion resistance [4][5][6][7][8][9]. Aluminizing forms intermetallic compounds on the surface of Mg alloys, such as the intermetallic phase β-Mg 17 Al 12 , which increase hardness and wear resistance [8].…”

Section: Introductionmentioning

confidence: 99%

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Nanomechanical properties of Mg–Al intermetallic compounds produced by packed powder diffusion coating (PPDC) on the surface of AZ91E

Chang

Zhang

Atrens

et al. 2014

Journal of Alloys and Compounds

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A packed powder diffusion coating (PPDC) treatment produced two intermetallic layers on the surface of the commercial magnesium alloy AZ91E. The β-phase (Mg 17 Al 12 ) was immediately on top of the AZ91E, on top of which was the τ-phase (Mg 32 (Al,Zn) 49 ). Nanoindentation showed that the elastic modulus and hardness of each of the intermetallic compounds was significantly greater than that of the AZ91E substrate. Staircase displacement bursts occurred during nanoindentation of the intermetallic compounds, attributed to the combination of incipient plasticity at low loads, and the development of dislocation networks due to dislocation pile ups around the indentation at higher loads. Crystallographic analysis of β phase orientations using EBSD showed that the nanomechanical properties of the intermetallic compound produced through PPDC treatment were isotropic.

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Section: Methodsmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

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Nanomechanical properties of Mg–Al intermetallic compounds produced by packed powder diffusion coating (PPDC) on the surface of AZ91E

Chang

Zhang

Atrens

et al. 2014

Journal of Alloys and Compounds

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“…The diffusion coating was also found to be rich in Mg 17 Al 12 phase, and the coated specimen was much more corrosion resistance and harder than the uncoated one. A pack cementation process with Al, Zn mixed powders has also been applied to obtain a diffusion coating on pure Mg, ZM5 Mg alloy and AZ91E alloy [26][27][28]. These diffusion coatings have better corrosion resistance in NaCl solution and higher hardness, which is due to the formation of Mg-Al-Zn intermetallic compounds.…”

Section: Pack Cementationmentioning

confidence: 99%

Protective diffusion coatings on magnesium alloys: A review of recent developments

Zhong

Fan

et al. 2012

Journal of Alloys and Compounds

162

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“…The solid medium is generally in the form of the metal powder, e.g. Al [3][4][5][6][7], Al+Zn [7][8][9][10][11], Zn+Al [12], Sb+Zn [13] or Zn+Y [14]. Layers fabricated on Mg or an Mg alloy using pure Al powder contained Mg-Al intermetallic phases.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Surface Layer of Mg Enriched with Al and Si by Thermochemical Treatment

Mola¹,

Stępień²,

Cieślik³

2017

Archives of Foundry Engineering

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The modified surface layers of Mg enriched with Al and Si were fabricated by thermochemical treatment. The substrate material in contact with an Al + 20 wt.% Si powder mixture was heated to 445 o C for 40 or 60 min. The microstructure of the layers was examined by OM and SEM. The chemical composition of the layer and the distribution of elements were determined by energy dispersive X-ray spectroscopy (EDS). The experimental results show that the thickness of the layer is dependent on the heating time. A much thicker layer (1 mm) was obtained when the heating time was 60 min than when it was 40 min (600 μm). Both layers had a non-homogeneous structure. In the area closest to the Mg substrate, a thin zone of a solid solution of Al in Mg was detected. It was followed by a eutectic with Mg 17 Al 12 and a solid solution of Al in Mg. The next zone was a eutectic with agglomerates of Mg 2 Si phase particles; this three-phase structure was the thickest. Finally, the area closest to the surface was characterized by dendrites of the Mg 17 Al 12 phase. The microhardness of the modified layer increased to 121-236 HV as compared with 33-35 HV reported for the Mg substrate.

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Surface alloying of AZ91E alloy by Al–Zn packed powder diffusion coating

Cited by 50 publications

References 25 publications

Nanomechanical properties of Mg–Al intermetallic compounds produced by packed powder diffusion coating (PPDC) on the surface of AZ91E

Nanomechanical properties of Mg–Al intermetallic compounds produced by packed powder diffusion coating (PPDC) on the surface of AZ91E

Protective diffusion coatings on magnesium alloys: A review of recent developments

Characterization of the Surface Layer of Mg Enriched with Al and Si by Thermochemical Treatment

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