Built on CHEMMAT 121, this is a core materials engineering course for the Chemical and Materials Engineering degree. The course will expand upon the critical understanding of Steel, looking at the Iron-carbon phase diagram in more detail to understand the phase transformations that occur. The effect of alloying elements and heat treatment on these phase transformations will be explored in detail. The fundamental roles of crystal defects in metallic structures will be revised and used to develop an understanding of phase transformation and strengthening mechanisms. Characterisation methods relevant to determining the features discussed in these sections will be introduced. These will include the use of X-ray diffraction (XRD), to characterise a material crystal structure, composition and preferred orientation, Scanning Electron Microscopy (SEM), to image samples at magnifications beyond what is possible with optical microscopy, and Thermal Analysis, to analyse energy changes associated with phase transitions as a function of temperature. The key mechanical properties of metals for mechanical design will be reviewed from the Engineering Stress-Strain curve. This will be expanded upon to include the use of true stress-true strain, which is critical for understanding the plastic deformation of materials in manufacturing operations. The critical role of fracture of metals will be described from a mechanistic perspective. Quantification of this mechanistic approach leads into the field of fracture mechanics, which is used to determine the effect of defects on the load-bearing capability of metallic components. Failure by fatigue and creep will be reviewed, highlighting the methods by which the failure mechanisms have been modelled and how this is used in design for failure prevention. The methods by which the defects accounted for in these models are detected in real-world materials are introduced through the field of Non-Destructive Testing. The lecture material is supported by three laboratories, covering metallography and steel structures, heat treatment of Al alloys and XRD.