A sample of aluminum and a sample of steel have superficially identical microstructures. Which would you expect to be stronger, and why?
as far as i know we have an alloy named dur alumin cosists of Al, alloying element especially Mg it is as strong as steel .
steel has Carbon in it to make it harder..the molecular attraction in steel Fe is greater than in aluminium aluminium is softer.... having said that..aluminium comes with additives as well the grade of aluminium used for the space station or car hubs is far better than aluminium used for windows...
By stronger I am assuming you mean it has a higher sheer point... Yes, standard iron-carbon alloys do have a higher sheer point because of the carbon atom placement in the lattice. You see, whenever a ferrous alloy is cooled rapidly, carbon atoms dont have time to move away from the iron, which is also known as ferrite. The steel becomes so rigid that the carbon atoms become trapped in the lattice as the iron atoms try to transform the cubic structure. The result is a structure where the carbon atom is an interstitial member. This makes it a tetragonal structure(martensitic), which takes allot of energy to sheer. This is not the only way, though, as there are a number of heat-treatment cycles for altering the structure of steel.
I swear with the aid of an all aluminum trailer! Aluminum over steel next, and that i'm hoping I in no way very own yet another steel trailer! I even have had trailers for, shall we see, 40 years now, and in simple terms bought my first aluminum one approximately 6 years in the past. it truly is 14 years old and apart from some bumps that WE put in it (the comparable quantity of bump could have dented a steel trailer too) it truly is in large shape. a 10+ 3 hundred and sixty 5 days old steel trailer exhibits a marvelous form of positioned on and tear, and should be sanded and painted in many situations.
If you define stronger to be a higher yield strength, then it's about dislocation movement. Dislocations form as a material begins to deform. As more deformation occurs, dislocations begin to move. Since steel is iron with impurities (namely carbon), these impurities impede dislocation movement. Aluminum, in pure form, does not have anything to impede dislocation movement except for the grain boundaries of the microstructure, which the steel also has if the microstructures are identical. If you define stronger as in ultimate tensile strength, then it becomes an issue of bond strength. Basically how tightly iron atoms bond to one another versus aluminum atoms. There are some quantum mechanical considerations at this point, but I won't get into those details.
