TOKYO – After a decade of flat or declining demand, magnesium may be getting a second look by Japanese auto-parts manufacturers. The lightweight metal, which is two-thirds as dense as aluminum, is used to make cylinder-head covers, oil pans, steering-wheel armatures, key locks and seat frames, but only on limited models. Among its more recent applications: the power-control-unit case for the Honda Insight, tweeters for the automaker's RLX Sport Hybrid, valve covers for the Toyota ...

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