Latest, novel engineering metal alloys have attracted considerable attention from research groups and industrial facilities globally because of their remarkable properties. Metallic glasses, or amorphous metals, are metallic alloys with non-crystalline structures. Instead, it has a disordered structure, with atoms occupying random positions in a lack of long-range order, as can be schematically seen in Figure 2.1. Figure 2.1 - Atomic structure of Cu65Zr35 glass, Cu atoms: red, Zr atoms: blue. Source: Mattern et al. (2009). This material class was first disclosed in the 60's. An Au75Si25 metallic glass alloy was synthesized from the melt at Caltech (KLEMENT; WILLENS and DUWEZ, 1960). This and other first glass-forming alloys had to …show more content…
2.1), of the glass transition temperature (Tg) to the melting point (Tm), or liquidus temperature (Tl) of an alloy, could be used as a criterion for determining the glass-forming ability of an alloy (WANG, DONG and SHEK, 2004, p. 45). T_rg=T_g/T_m (Eq. 2.1) In the late 80s, the greater stabilization of the supercooled liquid started the production of the so-called bulk metallic glasses (BMGs). With thicknesses that could reach 10 mm or more, with various alloys formed from early transition metals (Zr, Ti and Hf) and production of alloys containing late transition metals (Fe-Al-Ga-P-B), due to the low production cost (MILLER and LIAW, 2007). Present-day, BMGs of the systems based on Zr, Zr–Be, Pd, Pt, Mg, La, Ni, and Cu can be formed with diameters >2 cm, and Fe, Co and Ti based BMG can be produced with diameters >1 cm, fabricated by the cooper mold casting techniques (INOUE and TAKEUCHI, 2011). Figure 2.2 presents a few of the bulk amorphous alloys developed to date. BMGs can be formed by means of vast production methods: water-quenching, copper-mold casting, high-pressure die casting, arc melting, unidirectional melting, suction casting, and squeeze casting (MILLER; LIAW, 2007). Electromechanical conformation (OLIVEIRA et al., 2002), and warm extrusion of atomized amorphous powders in the supercooled liquid region are used techniques (INOUE, 2000). Figure 2.2 - Pd-, Ni-,
production was at its peak and had some very mixed results. In documents 4, 6, 7, 8 they show
We packed the powdered alum into a capillary then dropped it onto the lab table to make it move to the bottom. My group then strapped the tube onto a thermometer using a rubber band. Next, we clamped the thermometer with the capillary tube onto a ring stand with a rubber stopper. We dipped the thermometer and tube into a Thiele melting point tube that held silicon oil inside of it. My group heated the tube with a bunsen burner and waited for the powdered alum to melt from the capillary tube. We recorded the temperature at which the alum disappeared from the tube to get our melting point. This whole process was repeated to find a more accurate melting point than the first
When the water in the beaker has boiled for 10 minutes, pour the metal into the Styrofoam cup, and take the temperature, recording the highest one. Drain the water and remove and dry off the metal. III. Data: Trial 1 2 3 4 Mass of metal #8 60.33g
some of the particles may have peptized causing us to filter out some of the silver chloride
The purpose of this report is to help a financial special assistant, Linda, to analyze the financial position of Atlas Metals Company and deciding its capital budgeting and capital structure. Firstly, I explain why firm should use Net Present Value (NPV) methods for capital budgeting rather than Return on Investment (ROI) method and Payback Period method. Secondly, I calculate the Weighted Average Cost of Capital (WACC) which will be used as discount rate while calculating NPV. Then, I decide which rapid prototyping system company should invest as well as I compare the each expansion projects’ IRR with WACC to decide which projects should be invested and which should not. After deciding
You may have first learned about powder coating as a way to finish cars – but in fact, it can be used for many metal objects. Powder Vision in Issaquah, WA can powder coat many types of metal, including stainless steel, aluminum, brass, iron, and just about anything else. You could benefit from powder coating and not even realize it! Read on to learn about the types of objects this versatile metal coating can protect:
We calculated the specific heat of metal one to be 0.39 J/g℃ which correlates to the exact specific heat capacity of element 30 Zinc. For metal two, we calculated the specific heat capacity to be 0.38 J/g℃ which was close to the actual specific heat of element 23 Iron. The specific heat capacity of Iron was 0.45 J/g℃. Our inaccuracy could be a result of not reading the thermometer as accurately as we could have. To improve yield in the future, we could make sure we record more accurate temperatures.
Most of the metals in Periodic Table have high malleability. This also includes iron, aluminium and copper. By the term ‘malleable’, people mean, that the material can be easily shaped, reformed, stretched or other most physical changes, without breaking itself. Aluminium would be the highest malleable metal out of these three, as people created aluminium foils, which do not break under normal circumstances (only if someone would rip it). The second most malleable metal would be copper, because people created wires, which are larger in width than aluminium foil. Last, out of these 3 is the iron. With iron people can create small pieces that would not break, but they would still be larger compared to the metals above.
Ceramics Engineering-- the industry that Materials Technology Corporation, or "MTC" is a part of-- is a multi-billion dollar a year industry. Because ceramics can be manufactured to have unique combinations of strength, weight, thermal and magnetic conductivity, and deformability, they have countless uses in industries such as aerospace, biomedical, automotive, and electrical. With an unlimited number of such combinations, it is possible to create a material that exactly suits a given situation.
Copper is one of the earliest elements known to man. Because of its distinct red color, Copper is very easily identified. In the ancient times, copper could be found lying in the ground in its unattached state without interaction to other substances. Copper and its compounds have many uses in today’s society.
Glass has a variety of unique properties. Glass is hard, very brittle, a good insulator, and does not react to other chemicals easily. In addition to this, glass is considered an amorphous solid. This means that the molecular structure of glass is mostly random. This is because in the process of making glass, glass is cooled so quickly that it does not have time to form or create a structure at the molecular level. This process is known as quenching.
It seems as though the quasicrystals have many attributes not expected in a purely metal compound. For instance, the thermal conductivity values of quasicrystals are much smaller than imagined, making them perfect thermo-insulators. “Thermal conductivity at room temperature for AlFeCu and AlPdMn quasicrystals is more than two orders of magnitude smaller than pure aluminum and half that of zircon, which was previously thought to be one of the best thermo-insulators, (Jazbec, 2009).” In addition, the electrical resistivity of certain quasicrystals exceeds a value of 109 or 1010 larger than pure aluminum (Jazbec, 2009). Finally, the quasicrystals have a low friction coefficient, show high hardness, and incredible corrosive resistance. All of these attributes makes the possibilities for using quasicrystals
superalloys. We can, in principle, even use ceramic materials such as zirconia or other alloys
Zinc, number 30 on the periodic table and a bluish-white metallic element, exists naturally in air, water and soil. It is present everywhere in the environment. All life on earth has evolved in the presence of zinc. Natural processes such as erosion, forest fires, aerosol formation above the seas and volcanic eruptions continuously transport Zinc. Zinc melts at about 420° C and boils at about 907° C. Zinc is efficient for plants. Zinc-deficient soils present in many parts of the world are a cause of low crop yields. Not only does it help plants but also the human body. It is responsible for the proper functioning of more than 300 enzymes in the human body, and is vital for the immune system. It will also fight against cold
The Shape Memory Alloys are quite fascinating materials characterised by a Shape Memory effect and Super-elasticity, which ordinary metals and alloys do not have. This unique behaviour was first found in Au-47.5%Cd alloy in 1951, and was publicised by its discovery in a Ti-Ni alloy in 1963. After much research and development thereafter, shape memory alloys are now being practically used as new functional alloys for pipe couplings, antennae for cellular phones and various actuators in electrical appliances, etc. Furthermore, they have attracted keen attention as promising candidate for smart materials since they function as sensors as well as actuators.