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Materials Science A / Materiaalkunde A - 214

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Refer to the aluminium-magnesium (Al-Mg) phase diagram below which is adapted to include labels of various invariant points (viz. A, B, C, D, and E). Which of these point(s) are classified as congruent phase transformations? (Hint: Congruent phase transformations are transformations in which there is no change in composition of the phases involved). Select all that apply. 

Verwys na die aluminium-magnesium (Al-Mg) fasediagram hieronder wat aangepas is om byskrifte van verskeie onveranderlike punte (nl. A, B, C, D en E) in te sluit. Watter van hierdie punt(e) word as kongruente fasetransformasies geklassifiseer? (Wenk: Kongruente fasetransformasies is transformasies waarin daar geen verandering in samestelling van die betrokke fases is nie). Kies alles wat van toepassing is.

Image source / Beeld bron: Binary Alloy Phase Diagrams, Second Edition ASM International, 1996

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The aluminium-magnesium (Al-Mg) phase diagram is provided below. Use this diagram to match the statements below with the correct corresponding answers. 

Die aluminium-magnesium (Al-Mg) fasediagram word hieronder verskaf. Gebruik hierdie diagram om die stellings hieronder met die korrekte ooreenstemmende antwoorde te pas.

Image source / Beeld bron: Binary Alloy Phase Diagrams, Second Edition ASM International, 1996

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Match the incomplete statement with the correct missing word(s). 

Pas die onvolledige stelling by die korrekte ontbrekende woord(e).

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The image seen with a transmission electron microscope is formed by an electron beam that passes through the specimen

Die beeld wat met 'n  transmissie -elektronmikroskoop gesien is, word gevorm deur 'n elektronstraal wat deur die monster beweeg.

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Which of the following microscopy techniques generates a topographical map, on an atomic scale, that is a representation of surface features and characteristics of the specimen being examined.

Watter van die volgende mikroskopie tegnieke genereer 'n topografiese kaart, op 'n atomiese skaal, wat die kenmerke en eienskappe van die oppervlak  van die monster wat ondersoek word voorstel.

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What is the value of Boltzmann constant k?

Wat is die waarde van Boltzmann se konstante k? 

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The Hume-Rothery rules dictate whether two elements are likely to form a solid solution. Match the factor with the characteristic for each of these rules:

Die Hume-Rothery reëls gee die toestande waaronder twee elemente waarskynlik 'n vaste oplossing sal vorm. Pas die faktor by die kenmerk van elkeen van hierdie reëls:

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Carburizing is the term used to describe the diffusional process where the surface concentration of carbon is increased.

Karburering is 'n term wat die diffusieprosess beskryf waar die koosltof konsentrasie op die oppervlak neem toe.

 

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Select the correct term for the following descriptions:

Kies die regte term vir die volgende beskrywings:

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Interdiffusion is diffusion which occurs in pure metals, where all atoms which exchange positions are of the same type.

Interdiffusie is diffuse wat plaasvind in suiwer metale, waar alle atome wat posisies uitruil is van dieselfde soort.

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