Question

8. (2 pts) if we have a tem diffuse with a diffusion that is constante m Do What do we call this type of diffusion? __ S L OT [b] What equation should be used in this case? TL-D do (4 pts) The Hume Rothery rules help to identify what elements will form a solid solution Ustall four rules below (1) asoma radius <215 - Similar atomic size 12] Same elecHonogavity Crystal structures rystal structure electronegativites 141 Valancy - Valencies. 10. (4 pts) Based on the following data, which element could be the most soluble in Aluminum (Al)? Briefly justify your choice. Copper is the most soluble Element Radius Struct.El. Nes. Valence Aluminum (AI) 143 FCC 1.61 +3 Vanadium ( 134 BCC 1.63 Aluminum because it in Tantalum (Ta) 146 BCC 1.30 +3 has the highest Beryllium (Be) 112 HCP1.57 +2 Copper (Cu) 135 FCC 1.90 +1 electronegativity 11. 6 pts) Utilizing the outline of the blank plane below, sketch the 2-D projection of the (100) plane of the FCC structure. (Show the atom locations and where they touch. Identify edge lengths in terms of atomic radius, R.) Then calculate planar density as a ratio of occupied area to total area of the plane. area of plane pd: occuped ara 2R Since, a = V8 R pd: 2TR = 2 Planar Density = 2TR (18 R² 8R

Answer 1

Following is the - complete Answer -&- Explanation: for the first question ( i.e. Question - 8 ) , in...typed format...

$\Rightarrow$Answer:

1. part - (a): This type of diffusion can be called as:  Steady State Diffusion.
2. part - (b): In such cases: the Equation: given below: under Explanations ( Step - 2 ) , should be used.

$\Rightarrow$Explanation:

Following is the complete: Explanation: for the above : Answers.

• Step - 1:

​​​​​​​Since, the diffusion flux, in this case: remains constant : over time: we can call this type of diffusion: as Steady State Diffusion: i.e. according to the Fick's first law, of diffusion...

• Step - 2:

​​​​​​​For,  Steady State of Diffusion: the following law and equation: applies:

$\Rightarrow$ i.e. J = - D x ( dC/dx ) -------------------------------------------------Equation - 1

$\Rightarrow$ Where:

1. J = diffusion flux ; [=] atoms / (m² .s )
2. D = diffusivity or diffusion coefficient; [=] m² / s  
3. C = Concentration
4. x =  distance between two parallel planes, between which the atoms: diffuse through.
5. dC/dx =   Concentration gradient; [=] atoms / m⁴ ; i.e. change in concentration with varying distance, from diffusion plane...

For, Steady State Diffusion: the above : Equation - 1: would be valid...