In crystalline materials, the plastic deformation occurs when the group of atoms or molecules slides past each other.(a) True(b) FalseI got this question during a job interview.Question is taken from Plastic Deformation and Yield Criteria in chapter Types of Die & Metal Forming Processes of Casting-Forming-Welding II

In crystalline materials, the plastic deformation occurs when the grou

1.	In crystalline materials, the plastic deformation occurs when the group of atoms or molecules slides past each other.(a) True(b) FalseI got this question during a job interview.Question is taken from Plastic Deformation and Yield Criteria in chapter Types of Die & Metal Forming Processes of Casting-Forming-Welding II
Answer» Correct answer is (b) False Best explanation: Material ALWAYS shows a non-recoverable deformation when it is SUBJECTED to STRESSES beyond certain minimum stress. Crystalline materials experience permanent deformation when slipping occurs ALONG the definite crystalline planes. But in amorphous materials, permanent deformation occurs when the GROUP of atoms or molecules slides past each other.

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