A Sn-Pb alloy that contains 91.5 wt% Sn is cooled very slowly to just below the eutectic isotherm at around 183 °C (you can therefore use the solubility limits labelled on the eutectic isotherm). What is the mass fraction of the α phase? Give your answer to 3 significant figures. Remember to select the correct units. 

’n Sn-Pb-allooi wat 91.5 wt% Sn bevat, word baie stadig afgekoel tot net onder die eutektiese isoterm teen ongeveer 183 °C (u kan dus die oplosbaarheidslimiete gebruik wat op die eutektiese isoterm gemerk is). Wat is die massafraksie van die α-fase? Gee jou antwoord op 3 beduidende syfers. Onthou om die regte eenhede te kies.

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

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

Suppose metals are used for the above pole vault application. Use the selection chart below together with your understanding of metal properties to select the most suitable metal(s) based on the criteria mentioned above. Hint: You might want to refer to Ch 11.3 (10th ed) in the textbook. / Gestel metale word gebruik vir die bogenoemde paalspringtoepassing. Gebruik die onderstaande keuringsgrafieke saam met u kennis van metaal eienskappe om die mees geskikte metaal (metale) te kies op grond van die bogenoemde kriteria. Wenk: U sal dalk na Hfst 11.3 (10de uitgawe) van die handboek wil verwys.

Suppose metals are used for the above pole vault application. Use the selection chart below together with your understanding of metal properties to select the most suitable metal(s) based on the criteria mentioned above. Hint: You might want to refer to Ch 11.3 (10th ed) in the textbook. / Gestel metale word gebruik vir die bogenoemde paalspringtoepassing. Gebruik die onderstaande keuringsgrafieke saam met u kennis van metaal eienskappe om die mees geskikte metaal (metale) te kies op grond van die bogenoemde kriteria. Wenk: U sal dalk na Hfst 11.3 (10de uitgawe) van die handboek wil verwys.

Select the most suitable statement which matches the material in the context of these requirements. Use the material selection charts to aid you in your decisions. / Kies die mees geskikte stelling wat ooreenstem met die materiaal in die konteks van hierdie vereistes. Gebruik die materiaalkeusegrafieke om u te help met u besluite.

Match each function with a material type. Use the selection charts and accumulated knowledge of materials that you learnt in this course to assist you in your decision. / Pas elke funksie by 'n materiaal tipe. Gebruik die keuringsgrafieke en opgehoopte kennis van materiaal wat u in hierdie kursus geleer het om u te help met u besluit.

In the modulus-density selection chart, most of the material groups appear to lie on a diagonal straight line indicating that: / In die modulus-digtheidskeusegrafiek lê die meeste materiaalgroepe op 'n diagonale reguit lyn wat aandui dat:

In what situation would porous ceramics be preferred over ceramics (select all those that are applicable): / In watter situasie sou poreuse keramiek bo keramiek verkies word (kies almal wat van toepassing is):

The metals and alloys group covers a large area of both selection charts because (select all options that are applicable): / Die metale- en allooie groep dek 'n groot gebied van albei keuringsgrafieke omdat (kies alle opsies wat van toepassing is):