The resistivity of sample #2 was measured to be 2.90 x 10^-5 Ohm-cm. Alloys consist of small particles of a hard compound embedded in the tough, ductile background of a solid solution. This is your chance to share your innermost thoughts on White Material. In compliance with British law, the British fine art trade uses the term "white metal" in auction catalogues to describe foreign silver items which do not carry British Assay Office marks, but which are nonetheless understood to be silver and are priced accordingly. It is used for miscellaneous thin-walled and intricate castings. In many cases, these dislocations follow the flow lines. Electrical Properties A four-point probe must be used for accurate measurement for highly conducting materials like metals. Analysis of Metal Sample Mr. White, a Missouri resident, provided the National Institute for Discovery Science (NIDS) a piece of material that he purportedly obtained under unusual circumstances.
The outside surface has a tarnished, darker gray appearance with overlapping scale-like features. However, they seem to have grouped together in certain locations to form longer bands, either straight or curved. The difference is probably within experimental error. A Vickers Hardness number was obtained from a Leco Tester using a diamond tip micro-indenter. The fact that the Si particles are spheroidized (essentially equiaxed spherical particles) as opposed to the classic eutectic lamellar shape (elongated plates or needles) can be explained by the significant quantity of impurities like Na, Mg, etc. The material was delivered to New Mexico Tech, and the tests were conducted under the direction of Dr. Paul Fuierer, an Assistant Professor in the Materials Engineering Department. The coarse ones are easy to see, outlined by the porosity. Putting all of the above microstructural observations together, one can surmise that the metal was being deformed (pushed or blown) as it cooled from the molten state through the eutectic temperature (~ 577 degrees C) and solidified.
In terms of its chemical composition, sample #2 appears to be similar to what is known as a "360 aluminum casting alloy".
Since the material had not been previously tested, NIDS decided to have a battery of tests conducted. This average value, along with the known applied load were used to come up with the Vicker's Hardness number. Image. Physical Properties Density Bulk density of the sample was measured based on the Archimedes Principle by immersion in toluene. Microstructural Analysis Scanning Electron Micropcopy (SEM) The same slice of sample used for XRD was prepared by grinding and polishing to a mirror finish, followed by etching with 0.5% HF acid for 40 sec. Earn QUA for FREE by contributing to MovieQUA! Optional. Khosla (Anupam Kher) is a middle class man living in New Delhi. This is not surprising, considering the presence of undisolved silicon (2.33 g/cm^3) and significant amount of void space observed under the microscope. The analysis were double blinded. The truth is, AI is happening around us, right here, right now. 5 shows a couple of low mag shots of the parallel sample. Summary and Conclusions Results from the analysis of sample #2 are quite conclusive.
The four largest peaks are attributed to the aluminum metal, while the three small peaks (d = 3.1349, d = 1.9221, and d = 1.6375) are due to the presence of silicon. This is 91% of that of the theoretical density of pure A1 (2.71 g/cm^3). Since the material had not been previously tested, NIDS decided to have a battery of tests conducted. Since the eutectic is rich in aluminum, one would predict an Al-rich solid solution matrix with isolated particles of silicon.....just what we have.
All try to survive as their world rapidly crumbles around them.
The microstructure of the sample is one to be expected from the composition: second phase eutectic silicon particles in a matrix of aluminum solid solution.
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