Using the Al-Li phase diagram, if you start at point A (700 o C and 15% wt. % Li

Question

Using the Al-Li phase diagram, if you start at point A (700oC and 15% wt.

% Li) and cool down very slowly, sketch the microstructure

associated with each letter, determine what phases are present at each letter, determine the

compositions for each phase, and determine the weight in each phase. The 100 kg Al-Li

mixture has 15 wt. % Li in it. A = 700oC, B = 600oC, C = 575oC.

Point A) Microstructural drawing Phase(s) present

Weight % of Ni in each phase

Weight of each phase

Point B) Microstructural drawing Phase(s) present

Weight % of Li in each phase

Weight of each phase

Point C) Microstructural drawing Phase(s) present

Weight % of Li in each phase

Weight of each phase

If you had cooled the Al-Ni mixture at a moderately fast rate, how would the crystallite diameter be different? What effect would this faster cooling rate have had on the mechanical properties and on the material

Explanation / Answer

a) % of Li in Al phase = 0 %

    % of Li in AlLi phase = 25.723 %

    % of Al phase = 84.21 %

    % of AlLi phase = 15.79 %

for temp 700 oC & 15% Li

b) % of Li in Al phase = 0 %   

    % of Li in AlLi phase = 25.723 %

    % of Al phase = 77.647 %

    % of AlLi phase = 22.353 %

for temp 600 oC & 15% Li

c) % of Li in Al phase = 0 %  

    % of Li in AlLi phase = 25.723 %

    % of Al phase = 75.862 %

    % of AlLi phase = 24.138 %

for temp 575 oC & 15% Li

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.