Portland cement clinker microstructure C 3 S, C 2 S, C 3 A, C 4 AF 200 micron.

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Portland cement clinker microstructure C 3 S, C 2 S, C 3 A, C 4 AF 200 micron

Course admin 18 h lectures Course text: CALLISTER MATERIALS SCIENCE AND ENGINEERING 5TH EDN, WILEY, 2000 Selected chapters: 1-16, 18, 20 Tutorials from Week 5 Tutorial problems from Week 4 Supplementary material on web Feedback etc:

Course admin: website You will find course documents at

Summary To provide a broad introduction to the materials used in engineering, their properties and structures Module objectives On completing the module, students should  Be familiar with  the major classes of engineering materials  the mechanical, thermal and chemical properties of engineering materials, their definition, measurement and specification  Be able to locate material property data  Understand in qualitative terms the physical basis of material structure of the principal engineering properties of materials  Be familiar with  elementary concepts of ferrous metallurgy  the concepts of electrochemical corrosion  the major polymeric materials and their use as solid polymers, coatings, foams and adhesives  the main types of ceramics, cements and glasses used in engineering  the main materials processing operations

Thermal properties cluster Thermal expansivity  Thermal conductivity Specific heat capacity c Melting temperature T m … others?? CALLISTER Ch 20 [5th edn]

What is the melting temperature of iron? Quiz 19 Jan 09

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron?

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron? kg/m 3

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron? kg/m 3 What is the density of gold?

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron? kg/m 3 What is the density of gold? kg/m 3

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron? kg/m 3 What is the density of gold? kg/m 3 What is the density of air?

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron? kg/m 3 What is the density of gold? kg/m 3 What is the density of air? 1.2 kg/m 3

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the thermal expansivity of brass? 20  K -1 What is the density of iron? kg/m 3 What is the density of gold? kg/m 3 What is the density of air? 1.2 kg/m 3 What is the Young’s modulus of steel?

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the thermal expansivity of brass? 20  K -1 What is the density of iron? kg/m 3 What is the density of gold? kg/m 3 What is the Young’s modulus of steel? 200 GPa

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron? kg/m 3 What is the density of gold? kg/m 3 What is the density of air? 1.2 kg/m 3 What is the Young’s modulus of steel? 200 GPa What is the thermal expansivity of brass?

Quiz 10 Jan 08 What is the melting temperature of iron? 1540 °C What is the density of iron? kg/m 3 What is the density of gold? kg/m 3 What is the density of air? 1.2 kg/m 3 What is the Young’s modulus of steel? 200 GPa What is the thermal expansivity of brass? 20  K -1

Iron density

bcc fcc 912 °C

Explosive spalling in concrete under fire conditions Quartz... Major constituent of granite, quartzite and other mineral aggregates used in concrete Alpha-beta quartz transition Displacive structural transition 573 °C 2 % INCREASE in volume See Tucker, Keen and Dove, Min Mag 2001, 65,  

Invars Iron-nickel alloys with exceptionally low thermal expansivity  about 0.4  / K

Quiz 6 Feb 04 What is the effect of porosity on thermal expansivity? density? thermal conductivity? elastic modulus? strength?

Quiz 6 Feb 04 What is the effect of porosity on thermal expansivity? density? thermal conductivity? elastic modulus? strength? AsAs ApAp

Density Define volume fraction porosity f f = Volume voids/Total volume Bulk density  b =  s (1 - f ) where  s is solid density

Density Density relation is a simple example of the Law of Mixtures for material properties Composite material A, B with volume fractions f A, f B X com = f A X A + f B X B

Quiz 6 Feb 04 What is the effect of porosity on thermal expansivity? How does  vary with f ?  is independent of f AsAs ApAp

Thermal conductivity Defining equation q =  d T  d x where q is the heat flux Units w  (m K) Typical values and range w  (mK) See for example Ashby charts

Thermal conductivity Correlations with other properties speed of sound elastic modulus

Thermal conductivity Correlations with other properties For metals electrical conductivity Wiedemann-Franz law ratio of electrical to thermal conductivity is the same for all metals at a given temperature