MATS105 Introduction to Engineering Materials Semester 2

Flashcards for MATS105 lecture notes.

What topics are covered in Week 1 (28/01/2025)?

Introduction to Semester 2, revision of S1 and Intro to Phase Diagrams

What Labs are assessed?

Heat Treatment of carbon-steel (HT) Sem-1 10%, Phase Diagrams (PD) Sem-2 (Aero, Mech, Ind Des.) 10%, Cements and Concrete Lab Sem-2 (Civil & Arch Eng.) 10%

What materials are covered in the module?

Metals and alloys, Polymers and polymer-composites, Structural ceramics and glasses, Construction materials

What mechanical properties/testing/failure of materials are covered?

The tensile test & deformation, Hardness, Fatigue, Creep, Impact fracture

What are the different types of Metals?

Steels, Cast irons, Al-alloys, Cu-alloys, Zn-alloys, Ti-alloys

What are the different types of Ceramics?

Aluminas, Silicon carbides, Silicon nitrides, Zirconias

What are the different types of Polymers?

PE, PP, PET, PC, PS, PEEK, PA (nylons), Polyesters, Phenolics, Epoxies

What are the different types of Glasses?

Soda glass, Borosilicate glass, Silica glass, Glass-ceramics

What are the different types of Elastomers?

Isoprene, Neoprene, Butyl rubber, Elastomers, Natural rubber, Silicones, EVA

What are the factors affecting material property?

Atomic, Processing, Micro-structure

What is the relationship between materials properties, structure/microstructure, processing?

Crystal Structures, defects, microstructures and material types

What are the Practical Skills gained in this module?

Hands-on mechanical testing of materials (Optical microscopy, Tensile testing, hardness measurements & impact testing). Using GRANTA Edupack for materials and process selection.

What are the different types of Bonding?

Ionic, Covalent, Metallic, Secondary

What are Vacancies?

Vacant atomic sites in a structure

What are Self-Interstitials?

Extra atoms positioned between atomic sites

What are the Two outcomes if impurity (B) added to host (A)?

Solid solution of B in A (i.e., random dist. of point defects), Solid solution of B in A plus particles of a new phase

What causes plastic deformation?

Stresses greater than the yield stress cause plastic deformation (as well as small amount of elastic deformation).

What are Other ways to strengthen metals?

“Solid-solution” strengthening, “Precipitation” strengthening

What is Creep?

The time-dependant (permanent) deformation of metals when subjected to a constant load (stress) BELOW THE YIELD STRESS and at elevated temperature.

What is Fatigue failure?

Fatigue crack growth can take place slowly over many weeks/months/years in structures subjected to dynamic and fluctuating cyclic stresses

What are the Types of steel?

Ferrite, Austenite

What is the Phase diagram?

When we combine two elements… what is the resulting equilibrium state?

What are Components?

The elements or compounds which are present in the alloy

What are Phases?

The physically and chemically distinct material regions that form

What are Ferrous alloys?

Steels contain only up to ~2 weight% C, >12% Cr Steels contain only up to ~2 weight% C