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- Alloys -- Corrosion -- Testing<br />Aluminum alloys -- Corrosion -- Testing<br />Corrosion and anti-corrosives (1)
- Aluminum -- Corrosion<br />Aluminum alloys -- Corrosion<br />Aluminum -- Heat treatment<br />Aluminum alloys -- Heat treatment<br />Metals -- Quenching (1)
- Brass -- Metallurgy<br />Torsion pendulum -- Analysis (1)
- Glass<br />Glass -- Heat treatment<br />Internal friction (1)
- Hydrostatic pressure<br />Stress relaxation (1)
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- Iron -- Corrosion<br />Niobium -- Metallurgy<br />Electrochemical analysis (1)
- Lead<br />Metals -- Anodic oxidation<br />Oxidizing agents<br />Sulfuric acid (1)
- Magnesium alloys -- Experiments<br />Microhardness -- Experiments<br />Precipitation hardening (1)
- Metals -- Thermal fatigue<br />Thermal stresses -- Testing<br />Die-casting (1)
- Stainless steel -- Thermal properties -- Testing<br />Stainless steel -- Effect of temperature on<br />Stainless steel -- Fatigue<br />Metals -- Thermal fatigue (1)
- Zinc -- Metallurgy<br />Evaporation<br />Evaporation -- Measurement (1)
- Zinc -- Metallurgy<br />Zinc oxide<br />Electroplating -- Testing (1)
Articles 1 - 12 of 12
Full-Text Articles in Engineering
The Effect Of Thermal-Mechanical Processing Of The Exfoliation Corrosion Resistance Of An Aluminum-Zinc-Magnesium-Copper Alloy, James Lawrence Spehr
The Effect Of Thermal-Mechanical Processing Of The Exfoliation Corrosion Resistance Of An Aluminum-Zinc-Magnesium-Copper Alloy, James Lawrence Spehr
Masters Theses
"The objective of this investigation was to evaluate the effect of thermal-mechanical processing on the exfoliation corrosion resistance of an aluminum-zinc-magnesium-copper alloy. the aluminum alloy used was commercially available 7178 alloy in two thicknesses, 0.390 inch thick and 0.250 inch thick. this material was reduced 10, 25 and 40% in thickness in both the annealed and solution heat treated conditions. The material was then aged to a high strength condition, T6, or T8, in the case of the material reduced in the solution heat treated condition. The effect of the thermal-mechanical processing on the exfoliation corrosion resistance was then evaluated …
Thermal Fatigue Testing Of Die Casting Die Steels, Kulwant Singh Sabharwal
Thermal Fatigue Testing Of Die Casting Die Steels, Kulwant Singh Sabharwal
Masters Theses
"Thermal fatigue is a form of surface failure produced by repeated thermal stresses and is the main cause of die retirement in the die casting industry. A general review of the fundamental and practical aspects of thermal fatigue as encountered in the dies, based on earlier published work, is given and preliminary experiments in an effort to set up a suitable method of testing to study this phenomenon are then described. In the present technique developed to create the thermal conditions experienced by a die steel in aluminum die casting, a small portion of one face of a cylindrical test-piece …
The Effect Of Small Additions Of Niobium Upon The Corrosion Rates And Electrochemical Potentials Of Iron In Hcl, Hf, And H₂So₄, Richard Lee Jones
The Effect Of Small Additions Of Niobium Upon The Corrosion Rates And Electrochemical Potentials Of Iron In Hcl, Hf, And H₂So₄, Richard Lee Jones
Masters Theses
"The valence of niobium ions going into solution was determined by dissolving the metal in hot HF and measuring the volume of hydrogen evolved. The corrosion rates of Nb, NbHx, Fe and Fe - Nb alloys were determined in various concentrations of NCl, H₂SO₄ and HF. The Fe and Fe - Nb alloy samples were made by using powder metallurgy techniques. It was found that a metal skin was produced on the surface of iron corrosion samples if the carbon content of the surface layer was lower than that of the core of the sample. The lower carbon …
Effect Of Hydrostatic Pressure On Anelastic Stress Relaxation In A Mixed-Alkali Silicate Glass, Young-Gil (Gilbert Y.) Kim
Effect Of Hydrostatic Pressure On Anelastic Stress Relaxation In A Mixed-Alkali Silicate Glass, Young-Gil (Gilbert Y.) Kim
Masters Theses
"The effect of hydrostatic pressure on the anelastic stress relaxation of a mixed-alkali silicate glass (0.05 Na₂O, 0.95 K₂O, 3 SiO₂) was studied at 75°C between ambient pressure and 6 kbar. The activation volume of diffusion was found to be - 4.2 cm³/mole. It is proposed that a reequilibration of the defect population at pressure gives rise to the negative activation volume of diffusion"--Abstract, page ii.
A Continuous Method For Determination Of The Evaporation Rate Of Zinc, Paul Alan O'Neill
A Continuous Method For Determination Of The Evaporation Rate Of Zinc, Paul Alan O'Neill
Masters Theses
"A method for determination of the evaporation rate of zinc using a continuous recording balance has been devised. Tests were carried out under an inert gas over the range 600°C to 750°C with a total pressure of 1 atmosphere. It was found that the rate of evaporation doubled with an increase of 50°C in this range. Scanning electron microscope photographs show the crystalline nature of the condensate and the presence of a thin oxide layer on some solidified test samples. This oxide layer reduced the rate of evaporation by retarding the zinc vapor escape from the evaporating surface"--Abstract, Page iii.
Precipitation Hardening Of A Mg - 3.5 Wt. % Th - 1. Wt. % Mn Alloy, Adolf Chun-Chiung Huang
Precipitation Hardening Of A Mg - 3.5 Wt. % Th - 1. Wt. % Mn Alloy, Adolf Chun-Chiung Huang
Masters Theses
"The precipitation process in a Mg - 3.5 wt. % Th - 1. wt. % Mn alloy during aging at 260⁰, 350⁰ and 400⁰C was determined principally by transmission electron microscopy. At 350⁰ and 400⁰C, general precipitation of the equilibrium Mg₄Th phase moderately hardens the alloy. No transition lattice of this phase was seen. The Mg₄Th precipitate forms initially as disc shaped plates parallel either to the prism or basal plane of the matrix...During prolonged aging at 400⁰C the plates lengthen into long laths on either of the above planes in the close packed direction...At 260⁰C an unidentified G. P. …
The Effect Of Aging On The Exfoliation Corrosion Characteristics Of 7178 Aluminum Alloy, J. James Slavick
The Effect Of Aging On The Exfoliation Corrosion Characteristics Of 7178 Aluminum Alloy, J. James Slavick
Masters Theses
"The objective of this investigation was twofold: 1) to determine the effect of the quench-to-artificial aging delay period on the exfoliation corrosion of 7178 aluminum alloy subsequently aged at 250F for 24 hours and 2) to determine the effect of an initial aging treatment at 212F on the tensile properties and exfoliation of 7178 aluminum subsequently aged at 250F. Testing was conducted on 0.125 inch thick sheet. Quench-to-aging delay periods of 0 to 28 days, and initial artificial aging treatments at 212F for 24 and 48 hours were investigated. In addition, the effect of overaging T6 material at 320F for …
Internal Friction Of Phase Separated Glasses, Scot Walter Taylor
Internal Friction Of Phase Separated Glasses, Scot Walter Taylor
Masters Theses
"The large internal friction peak observed in a 10Li₂O·10Na₂O·80SiO₂ glass was studied as a function of the degree of phase separation. Transmission electron microscopy was used to evaluate the type and degree of phase separation. No observable changes in the temperature position or height of the internal friction peak were observed at successive stages of phase separation. Phase separation of a mixed alkali borosilicate glass also produced no changes in the internal friction peaks. Phase separation is not considered responsible for the large internal friction peak observed in mixed alkali glasses"--Abstract, page ii.
Establishment Of A Torsion Pendulum And Its Evaluation, Ashwin Kantilal Ghatalia
Establishment Of A Torsion Pendulum And Its Evaluation, Ashwin Kantilal Ghatalia
Masters Theses
"A torsion pendulum apparatus has been constructed. The pendulum has been evaluated by studying the Zener relaxation in α brass. Three wire specimens of commercial alloy of Cu-Zn were used and the value of log decrement has been obtained by the method of free decay of the oscillations. The known Zener peak was observed"--Abstract, page ii.
The Electrodeposition Of Zinc; Changes In Current Efficiency And Surface Structure Resulting From Various Addition Agents, Haruhisa Fukubayashi
The Electrodeposition Of Zinc; Changes In Current Efficiency And Surface Structure Resulting From Various Addition Agents, Haruhisa Fukubayashi
Masters Theses
"An examination of the surface structure of zinc electrodeposited from an acid-sulfate solution was made by scanning electron microscopy techniques. The current efficiencies were also determined, to a lesser extent, in order to correlate the results with the surface structures. Commercial and pure zinc oxide were used to prepare the neutral zinc sulfate solutions. The starting solutions were in a range of acid and zinc concentrations commonly used in commercial practice. Changes in morphology resulting from addition agents such as animal glue, gum arabic, and sodium silicate are compared"--Abstract, page ii.
Thermal-Fatigue Of Type 304 Stainless Steel, Gajinder Bir Singh Arora
Thermal-Fatigue Of Type 304 Stainless Steel, Gajinder Bir Singh Arora
Masters Theses
"Thermal fatigue resistance of unrestrained samples of type 304 stainless steel has been investigated under different test conditions. The following studies are reported: (a) effects of heating and cooling rates on the initiation of cracks, (b) effects of upper and lower cycle temperatures on the initiation of cracks, (c) effect of water quenching and (d) the manner in which cracks initiated and propagated. It is shown that under cyclic conditions involving maximum temperatures up to 1000°C, the thermal fatigue life of the material decreases rapidly with rise in the maximum temperature of the cycle. The increase in the lower cycle …
Anodic Oxidation Of Pure And D.S. (Dispersion Hardened) Lead In Sulfuric Acid Solutions, Rafael San Martin Aldazabal
Anodic Oxidation Of Pure And D.S. (Dispersion Hardened) Lead In Sulfuric Acid Solutions, Rafael San Martin Aldazabal
Masters Theses
"The anodic oxidation of pure and dispersion hardened lead in 1 N H₂SO₄ was studied potentiostatically in the range - 0.28 to 2.0 volts (SHE). The anode surfaces were observed at various stages on a scanning electron microscope and x-ray diffraction techniques were used to determine the phases present. It was established that by oxidation up to 0.25 v only PbSO₄ is obtained. At potentials between 0.25 and 1.57 v, PbO (tetragonal) is formed beneath the lead sulfate layer. At potentials above 1.57 up to 2.0 v, a layer of ßPbO₂ forms in the outermost part of the anode underlying …