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Selective laser melting was used to manufacture the magnesium Mg–Al–Zn–X–Mn (Mg) alloy samples, while outer heat treatment cycles (HTC) and plasma arc transfer (PAT) Ti 54 Al 23 Si 8 Ni 5 X Nb+Ta  coating technique were used to improve the outer surface. On selective laser melting (SLM) samples, the hexagonal closed structure, Mg 2 Al 3 , and α′-MgSi structure produced the strong bonding strength. MgOx phase, MgZn structure, and the Al–Mg–Si ternary phase all significantly improved the outer surface layer after heat treatment at 1,200–1,350°C. At PAT coating samples, the Mg–Si phase, Ti–Al–Mg–Mo phase, Ti–Mg structure, and Ti-twin boundaries were observed, while the outer surface was shielded by the AlSi structure, Ti-inter binary phase, and AlMn basket structure. According to the texture image, MgTi 1 &lt;0001&gt;, MgTi 2 &lt;1011&gt;, and MgTi 3 &lt;2110&gt; MgTi 4 &lt;2121&gt; outer layers were shielded by the magnesium lattice ternary phase. HTC samples had an 8% harder surface than Mg-SLM samples, but PAT coated samples had a 21% harder surface in both the inner and outer layers. The (µ/β) Mg-coarse grain boundaries, β-MgTi phase, and Ti–Si–Mn structure steadily increased. HTC samples had an average tensile strength of 8% elongation, but PAT coating samples showed a high yield strength and ductility ratio of 13%. The surface roughness, corrosion rate, and wear resistance of the Mg-SLM sample were studied as the outer layer HTC and PAT coated samples were gradually enhanced.

high temperature materials and processes

Influence on hexagonal closed structure and mechanical properties of outer heat treatment cycle and plasma arc transfer Ti 54 Al 23 Si 8 Ni 5 X Nb+Ta  coating for Mg alloy by selective laser melting process