The class of hexagonal close packed (HCP) metals, such as Mg and Ti, can provide a potential solution to the ever-increasing portfolio of structural applications that require advanced materials with unprecedented combinations of mechanical properties. Successful incorporation of HCP metals into engineering designs is, however, hindered by their limited plasticity. Recent results have introduced the exciting potential of "twin mesh engineering" to overcome the long-standing problem of simultaneous strengthening and toughening in HCP metals.

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