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

Ask an Expert

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

Write your message here..

Related Questions

What is the company’s net working capital, Working capital: Laurel Electron... Working capital: Laurel Electronics reported the following information at its annual meetings. The company had cash and marketable securities worth $1,235,455, accounts payables wo

Metal cutting tool, how to design a circural form tool on drawing sheet? how to design a circural form tool on drawing sheet?

Combustion chamber injection system - aircraft engine , Combustion chamber ... Combustion chamber injection system: Injecting a water or water/methanol mixture into the combustion chambers increases the mass flow through the turbine and the high volumetri

QMETER, Explain how a Q-meter can be used to measure resistance inductance ... Explain how a Q-meter can be used to measure resistance inductance and capacitance??

Ts diagram, how to find points on Ts diagram? how to find points on Ts diagram?

Variation of energy bands with alloy composition, variation of energy bands... variation of energy bands with alloy composition

MIMO, I need some help I need some help

DPC IN CIVIL ENGINEERING, I WANT TO KNOW WHAT IS DPC TERM MEANING IN CIVIL... I WANT TO KNOW WHAT IS DPC TERM MEANING IN CIVIL ENGINEERING

Comparator, Comparator A comparator is a device, which compares two inp... Comparator A comparator is a device, which compares two input voltages and indicates at the output, which of the two is the larger.  Basically, the circuits use a differential

What is thermodynamics, Electrical Engineering Online Electrical Engineerin... Electrical Engineering Online Electrical Engineering Study Sit