ENGINEERING SCIENCE, Other Engineering

QUESTION 7
As a forensic materials expert – you have been asked to identify a metallic powder found on the clothing of someone suspected of fabricating an incendiary device used in an armed robbery.
The suspect suggests that the powder is tungsten – which he uses a lot in his line of work. The police believe that the powder is part of a chromium/silver/nickel mixture often used in such devices. Armed with the following information from an X-ray powder diffraction analysis – what can you conclude?
Using Cu ka radiation of 0.1542nm, three large diffraction peaks were observed at 44.4°, 64.6° and 81.7°.

QUESTION 9 – Crystallographic transformation
On cooling from the molten state, titanium solidifies into a BCC lattice structure. However, on cooling to below 880°C, a change occurs whereby the crystal structure transforms into an HCP structure. Assuming the number of atoms remains constant and that the lattice parameters are as shown below, calculate the volume change associated with this transformation.
For the BCC lattice: a = 3.32Å
For the HCP lattice: a = 2.956 Å and c = 4.683 Å
Titanium is a commonly used metal in engineering structures. Explain why your findings above should be cause for concern if these engineering structures are to be used at high temperatures.
Posted Date: 3/25/2013 9:14:33 PM | Location : Australia







Related Discussions:- ENGINEERING SCIENCE, Assignment Help, Ask Question on ENGINEERING SCIENCE, Get Answer, Expert's Help, ENGINEERING SCIENCE Discussions

Write discussion on ENGINEERING SCIENCE
Your posts are moderated
Related Questions
how to find points on Ts diagram?

What are the no-arbitrage lower bound, and the no-arbitrage upper bound, of the vertical spread

how thermoelecteric thermometer is contructed and how it working

How do I create a demand schedual for 1 year?

how to find points on Ts diagram?

Fire safety log book: The occupier's fire safety log book should be checked during an inspection to see that the system is being tested regularly and serviced and maintained a

Suggest an example of a decision from your own experience which you feel is best treated as a decision without probabilities. What principle of choice would seem appropriate?

Is there anyone on your staff good with HEC-HMS software for modeling rain events?

Navigation Systems  • Traditional guidance systems used mechanical gyroscopes (rate gyros) to measure the angular velocities of the vehicle or of the gimbals on which the seeke

based on your managemet style or your personal perspective, discuss how you developed your viewpoint how it will influence the way you manage, and what challenges you migt face if