| Magnesium-Nickel MgNi2MgNi2 |
| Manganese-Copper Mn-CuMn-Cu 95/5 wt%, 90/10 wt%, 80-20 wt%, 70-30 wt%, 50-50 wt%, 66-34 wt% |
| Manganese-Iridium Mn-IrMn-Ir 80/20 at%, 78-22 at% |
| Manganese-Nickel Mn-NiMn-Ni 70/30 wt%, 80-20 wt%, 88-12 wt%, 55-45 wt%, 8-92 wt%, 25-75 wt%, 60-40 wt% |
| Manganin Mn-Ni-CuMn-Ni-Cu 12/4/84 wt% |
| Moleculoy ® Cr-Al-Co-NiCr-Al-Co-Ni 20/3/2/75 wt% |
| Molybdenum-Aluminium Mo-AlMo-Al 55/45 wt% |
| Molybdenum-Chromium Mo-CrMo-Cr 90/10 wt% |
| Molybdenum-Rhenium Mo-ReMo-Re 52.5/47.5 wt% |
| Molybdenum-Rhenium Mo-ReMo-Re 59/41 wt% |
| Molybdenum-Silicon Mo-SiMo-Si 80/20 at%, 82-18 at%, 50-50 at%, 40-60 at% |
| Molybdenum-Titanium Mo-TiMo-Ti 80/20 wt%, 90-10 wt% |
| Monel 400® Ni-Cu-FeNi-Cu-Fe 66/32/1 wt% |
| Monel K500® Ni-Cu-Fe-Al-Mn-Ti-SiNi-Cu-Fe-Al-Mn-Ti-Si 65/29.5/1/2.8/0.6/0.5/0.5 wt% |
| Monel R405® Ni-Cu-Fe-Mn-SiNi-Cu-Fe-Mn-Si 66/31.5/1.35/0.9/0.15 wt% |