Magnesium alloys are the lightest of all practical alloys and have a great weight-reduction effect, thus they are expected to be applied to vehicle bodies. Recently, the development of a composite material (cladding plate) between magnesium alloys and aluminum alloys is drawing attention to achieve. Magnesium alloys and aluminum alloys are difficult-to-weld materials since the bonding strength is reduced by forming a brittle intermetallic compound layer at the bonding interface due to heat input during joining. In the present study, the explosive welding method, which is a type of solid-phase welding, is applied to the dissimilar joining of Mg/Al alloys. This method utilizes the instantaneous high energy generated by the explosion of explosives for metal bonding and has almost no thermal effect except for local heat generation near the bonding interface. Previously, it was revealed that a thin interlayer was formed at the interface in cladding plates produced by explosive welding between magnesium alloys having different aluminum concentrations and A6005C aluminum alloy. The thickness of the interlayer increased with an increase in aluminum concentration in the magnesium alloy, while the thickness was 1μm or less. Scope of this study is to clarify the effects of aluminum alloy compositions on the interfacial microstructure and mechanical properties of the cladding plates. In the AZ31/A6005C and AZ31/A5052 cladding plates, when the magnesium concentration in the aluminum alloy was high, the thickness of the interlayer increased, and the shear strength increased. Although the thickness of the interlayer is not uniform, the weldability might be improved as the thickness of the interlayer increases. In the AZ80/A6005C and AZ80/A5052 cladding plates, when the magnesium concentration in the aluminum alloy was high, the thickness of the interlayer became very large (5μm or more), and the shear strength decreased.
Mami Mihara-Narita received her PhD in engineering from Tokyo Institute of Technology, Japan, in 2017. From 2017, she was a researcher at UACJ corporation. In 2019, she joined the Department of Physical Science and Engineering at Nagoya Institute of Technology, as an Assistant Professor. She has received several academic awards as the first author including the Light Meatal Promising Graduate Award (JILM, 2014), the Best Poster Award (JIMM, 2014, and 2017), the Best Poster Award in ICAA-15 (2016), Light Metal Outstanding Female Award (JILM, 2019), the Encouragement Prize for Young Researcher (Nagoya Institute of technology, 2007). Her research focus is on improvement of the properties of light metals by microstructure controlling, dissimilar metal joining of light metals, and severe plastic deformation of aluminum alloys.
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