Lecture on Deformation Mechanisms

A talking hand lecture on elastic and plastic deformation mechanisms in metals. Bond stretching, dislocation slip, slip systems, resolved shear stress, and slip in polycrystals. I love this stuff!

[@brianbender7438]

Professor Lyons, Thank you for the excellent lectures. I just discovered your channel and watched 3 sessions tonight. Your presentation style is perfect so I gain plenty of knowledge. Keep it up. Thanks again.

[@9217589795]

great video, very good explanation.. thanks

[@muhammadikramullah12]

its really very helpfull.

[@docery47]

Thank you for the excellent lesson. With reference to the last 3 minutes...can I assume that the overall slip plane will occur at 45 degrees, regardless of how each individual grain's slip plane is orientated? For instance, if there are a greater majority of grains positioned parallel to the applied force, would the slip plane still occur at 45 degrees? Visually, I picture the atoms on the northern-right (chosen orientation) side being shifted upward, and each southern atom follows behind but staggered down one atom in reference to the horizontal.

[@jedlyonsphd]

If the orientation or the crystal structure in the grains is random, then in some grains slip will occur on planes at greater than 45, and in other grains on plans less than 45. Overall, the average slip path will be at 45 degrees to the tensile axis.

[@bm510]

Hi, great video. I am not a student of yours, obviously. I found the video interesting. In particular, could you direct me to a source that discusses your topics on elastic behavior? Specifically, I am interested in learning about the force curves you drew in that section. I find the proportional tie between modulus of elasticity and the forces in that graph interesting. It may help me understand the origin of a standard tensile strength curve. Thank you