Assignment: This week's assignment will be the following: 1. Explain how differences in the ways ions are packed in a solid and can lead to the different structure of: a). simple cubic b). face centered cubic c). centered cubic d). close packed hexagonal.

1. In the table on the following page are excess Gibbs energy of mixing data for three liquid solution phases at various temperatures and compositions (units: Joules/mol). Using these data, determine for each system whether the data are best fitted by a regular solution model, a subregular solution model, a sub-subregular solution model. In each case, give the coefficients determined from your fitting, using Au, Ti and Zn, respectively as element B.

3. Using the Gibbs-Duhem Equation, prove that if the minority element obeys Henry's Law, the majority element must obey Raoult's Law.

1. The mass of an object can be expressed as its volume times the density of the material. You have a steel sphere, and you measure the diameter to be 25.0 mm. If the standard uncertainty of your diameter measurement is up 0.1 mm, what is the expanded uncertainty of the sphere volume? State the volume with its uncertainty in an acceptable manner.

2. You use a mass balance to determine the mass of the sphere, and find it to be 62.3 grams with an estimated standard uncertainty of um = 0.2 grams. State your estimate of the density of the sphere with its expanded uncertainty.

The technical objectives of this lab are to: • Perform a Vickers hardness test on three samples with different heat-treatments; • Perform a Charpy impact test on the three samples; • Observe steel microstructures in an optical microscope.

Brief: An aircraft manufacturer has asked a consulting engineer (you) to prepare a short report on experimental stress analysis techniques that could be used for design, testing, or in-service monitoring of structural components. They are particularly interested in the electrical resistance strain gauge and digital image correlation methods. Prepare a short report for the company which covers both electrical resistance strain gauging and digital image correlation for use in experimental stress analysis. The report should briefly introduce experimental stress analysis and its relevance, introduce strain gauges and digital image correlation methods and give relevant background to each. You should then cover the fundamental concepts and mode of operation (how it works!) associated with each technique and give guidance for obtaining accurate measurements. Finally, critically compare the methods, give suitable applications for each technique in aircraft engineering and offer conclusions and recommendations to the aerospace company using the information you have gathered as evidence.

Provides a recommendation to the editor which is justifiable by the above criticism

Application 3 A sports company is looking to design a pole to be used in pole vault competitions.

Application 4 - A tool company is looking to design a new cutting tool for higher temperature applications.