Abstract: In the present study, the conventional process of Compo-casting was carried and the
microstructural and mechanical propertied were then investigated. The matrix alloy used was Mg-
6Al, and B2O3 was added into Mg-Al alloys was investigated at two levels of 3 and 6wt%. The other
experimental materials were NaCl and CaCl2. The microstructures were of the samples analyzed with
Optical Microscopy, SEM and XRD, and the mechanical properties were determined by
micro-hardness and tensile test. The results showed that the mechanical properties of Mg- 6Al-
3B2O3- 1NaCl- 1CaCl2 increased and the microstructure was satisfactory, for a cast alloy, i.e.the
tensile strength was 175MPa.
Abstract: Nano-indentation technique was used to survey creep stress exponent of ZM6
(Mg-2.8Nd-0.7Zn-0.6Zr) alloy at room temperature. The results showed that average press creep
stress exponent of ZM6 alloy was about 89.75, and independent of strain rate and hardness, which has
been verified by linear relationship of the double logarithmic plots between strain rate ( ε& ) and
hardness (H ) measured by a nano-indentation equipment with constant load of 500mN.
Abstract: Mg is the lightest structural metal with the highest specific strength. It is therefore
considered as a solution for vehicular mass reduction so as to reduce the fuel consumption and
greenhouse gas emission. Unfortunately, Mg and its alloys are highly susceptible to corrosion,
particularly in salt-spray conditions. This has limited its use in the automotive and aerospace
industries, where exposure to harsh service conditions is unavoidable. To improve its corrosion
resistance it is viable to apply a desirable engineering coating on the Mg surface.This communication
discusses the practical aspects of magnesium surface modification based on our review. A novel
immersion coating process is also discussed along with the corrosion behavior of coated and uncoated
AZ91 magnesium alloy.
Abstract: A hybrid biomaterial was produced by dressing titanium with magnesium in order to utilize
the most advantageous properties of both materials. Titanium was coated with magnesium via arc
physical vapor deposition (PVD) method, and a third agent between titanium and magnesium, as a
bonding medium was also used. The microstructures and chemical compositions of magnesium
arc-PVD coated Ti-6Al-4V alloy and silicon wafer were investigated. The experimental results
showed that Mg can be deposited onto Ti-6Al-4V alloy and on silicon wafer by using arc-PVD
Abstract: The common joining techniques for Mg sheet and die cast alloys such as riveting,
friction-stir welding and adhesive bonding all introduce additional challenges for protection in the
joining areas. First of all, the sheet products are prone to high rate of corrosion due to surface
contamination. Introduction of iron-rich contaminants can be encountered from the friction-stir
welding process. Although powder coating on top of conversion pre-treatments is practical for
mitigating corrosion, the lap-shear adhesion of such surfaces can be negatively impacted when the
adhesively bonded joints are exposed to a corrosion environment. Anodized surfaces are better in
terms of their ability to retain adhesion strength, but their resistance to galvanic corrosion is an issue.
Development of galvanically compatible coatings for steel rivets will benefit the adaptation of
riveting as a joining technology for magnesium.
Abstract: Aluminum spray coating was applied onto AZ91D magnesium alloy. The effects of post
heat treatment on the interfacial characteristics, especially the diffusion kinetics of magnesium and
aluminum atoms across the interface were studied in this paper. It was observed that there was an
obvious interface between the aluminum coating and the magnesium alloy substrate. It was found that
post heat treatment could reduce the number of pores existed in the aluminum coating. The post heat
treatment resulted in not only the change in the composition and microstructure of the aluminum
coating, but also the improved metallurgical bonding between the coating and the substrate.
Abstract: Microstructural examinations of T6-treated WE54 magnesium alloy were conducted after
different aging conditions, and the influence of aging on electrochemical behavior of this alloy was
investigated. For three batches of samples, with increasing aging time, the amount of precipitate
phases was greatly promoted, and they formed in a strengthening continuous way. Electrochemical
study showed that the value of corrosion potential followed the tendency to decrease when the aging
condition transformed from under-aged to peak-aged. However, after peak-aging, the corrosion
potential was raised to higher values. Explanations for the observed phenomena were based on the
relationship between microstructure, especially precipitate phases, and electrochemical behavior. At
under-aged condition, matrix served as galvanic cathode and precipitates acted as galvanic anode.
Because the amount of precipitate would rise with prolonging aging time, it is natural that corrosion
potential decreased. For over-aged alloys, metastable precipitate phases might in situ change to
equilibrium phases, rendering increase of corrosion potential possible.
Abstract: The corrosion of AZ91 magnesium alloy with residual stress was observed in-situ in an
atmosphere of water vapor with cyclic wet-dry conditions using environmental scanning electron
microscope (ESEM). The results showed that the oxygen concentration on the surface generally
increased with the wetting time. And the average corrosion rate of AZ91 alloy with residual stress
(RS) was much larger than that without RS, indicating RS accelerated corrosion. The corrosion
localized at primary α-Mg area at short wetting time, but with the increase of wetting time spread to
the eutectic α-Mg region. Small-size as-cast defects (<50μm) contributed little to the average
corrosion rate while large-size as-cast defects (>100μm) influenced the distribution of water film and
corrosion on the surface.
Abstract: Effect of pulsed high-energy electron beam on the surface modification and the state of
surface layer and wear resistance of AZ91 magnesium alloy have been investigated in this study.
Optical microscope (OM) and X-ray diffraction (XRD) were employed to characterize the
microstructure and phase composition of the modified surface layer. It was found that the thickness of
melted layer on the surface varied with electron beam current and the numbers of pulses, the treated
surface layer exhibited higher hardness than AZ91 alloy. The friction coefficient and the wear volume
of AZ91 alloy after electron beam treatment decrease markedly. The wear resistance of treated
samples were significantly improved, which may be attributed to high hardness as a result of grain