Chad Huard » BE1300 Materials

Lab 2 – Quantitative Metallography

Chad — Fri, 05 Mar 2010 00:02:37 +0000

Quantitative metallography is the study of metallic crystal structures from the perspective of numeric quantities. Examples of quantitative metallographic measurements include number of grains per unit area and fraction of specific phase per unit volume. These two quantities are what we will investigate in this lab.

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Lab 3 – Semiconductors

Chad — Thu, 04 Mar 2010 18:09:33 +0000

The purpose of this experiment is to determine the band gap energy (E0) in the elemental solid germanium. In a semiconductor like germanium electrons must be promoted from the valence energy band through the band gap to the conduction band in order for the substance to conduct electricity [1]. Therefore, the band gap can be thought of (in a semiconducting element) as the amount of energy required to for the element to conduct electricity.

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Lab 4 – Cold Work

Chad — Thu, 04 Mar 2010 13:01:00 +0000

The purpose of this experiment is to determine the increase in hardness of an annealed (heat treated) copper sheet after it is passed through a rolling mill. The rolling mill reduces the thickness of the copper sheet by exerting compressive stress. This is an example of cold working, as the deformation of the copper sheet is performed at a temperature below that at which recrystallization occurs.

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Lab 6 – Creep

Chad — Thu, 04 Mar 2010 01:45:08 +0000

Creep is a condition where a material will undergo progressive plastic deformation under constant load or stress. In most metals, this behavior is only present at elevated temperatures, but a few soft metals like tin and lead will experience creep at room temperatures. This experiment will explore the creep behavior of lead.

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Lab 5 – Tensile Testing

Chad — Wed, 03 Mar 2010 13:26:07 +0000

Tensile testing is an important aspect of material science. Many of a materials mechanical properties can be ascertained through tensile testing. In this lab we will use data from a tensile test of a sample taken to fracture. From this data we will be able to find the materials Modulus of Elasticity (E), Poisson’s ratio, ductility and ultimate tensile strength.

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