Compilation of metallurgy job interview question and answers for engineering students. Metallurgy Job Interview Question # Q.1. What are the Properties of Non-Crystalline Solids? Ans. i. Non-crystalline solids are isotropic, i.e., exhibit same physical and chemical properties in every direction. This is because on an average, the extent of disorder is the same in every direction. But a crystal shows [...]
Here is a compilation of exam questions with answers on metallurgy for engineering students. Q.1. What do you mean by Space Lattice? Ans. Crystal structures are regular three dimensional patterns of atoms in space. These regular arrangements of atoms arise due to geometrical conditions which are imposed by directional bonding (if present in the bond) and close packing. In a [...]
Here is a compilation of interview question and answers on metallurgy for engineering students. Q.1. Describe the Crystal Structure of Metals? Ans. Crystal structure of most metals consists of one atom at each lattice point of the space lattice. These crystals are called monoatomic crystals, though often this adjective is missing. For example, copper is face-centred cubic metal. If one [...]
Here is a compilation of metallurgy exam question and answers for engineering students. Q.1. What are the Properties of Non-Crystalline Solids? Ans. i. Non-crystalline solids are isotropic, i.e., exhibit same physical and chemical properties in every direction. This is because on an average, the extent of disorder is the same in every direction. But a crystal shows anisotropy, i.e., directionality [...]
Compilation of useful notes on metallurgy. Note # 1. Introduction to Metal Forming: Metal forming is the backbone of modern manufacturing industry besides being a major industry in itself. Throughout the world hundreds of million tons of metals go through metal forming processes every year. As much as 15-20% of GDP of industrialized nations comes from metal forming industry. Besides, [...]
Griffith attributed the discrepancy between the observed fracture strength of crystals and the theoretical cohesive strength to the presences of flaws in brittle materials. This theory is applicable only to perfectly brittle material such as glass, and cannot be used directly to metals. However, Griffith's ideas formed a base to understand the fracture in metals. Griffith proposed that a brittle [...]
In this article we will discuss about the solidification of polycrystalline materials with its schematic diagram. A space lattice is formed by adding unit cells one after the other in three dimensions. It is possible to produce a macroscopic visible piece of a metal, formed by repetition of unit cells of crystal structure of that metal in three dimensions of [...]
In this article we will discuss about the shapes of phases with its diagram. Any surface or an interface such as a grain boundary has energy related with it, which acts like a surface tension. A solid phase does not easily change its shape in response to the surface tension (due to rigid bonds between atoms in a solid), unless [...]
In this article we will discuss about:- 1. Introduction to Solid Solution of Metals 2. Types of Solid Solutions 3. Hume Rothery's Rules for Primary Substitutional Solid Solubility. Introduction to Solid Solution: When the liquid solution of two metals crystallises, and if a solid of only single crystal structure forms, then a solid solution has formed. This happens when atoms [...]
Al-Si diagram is a eutectic diagram where solid solubility at least of aluminium in silicon is negligible, and maximum solubility of silicon in aluminium (at eutectic temperature) is 1.65%. The eutectic composition is 12.7% silicon. Fig. 3.18 illustrates this diagram and photomicrographs of alloys at room temperature. Alloys of Al-Si are very important casting alloys mainly because of high fluidity [...]