4. For high technological inustries you evaluate metals and ceramics beyond the

Question

4. For high technological inustries you evaluate metals and ceramics beyond the F alloys to more costly applications. A. (50) Select three alloying components for Ti alloys to give alpa+beta phases from simple solidification or peritectic reaction and beta+gamma phases from a eutectic reaction. (25) B. As you consider the alloying additions to stainless steels, discuss five elemental components enhancing or degrading the metals' value. C. Liquid Zr of 1 kg infuses into a BC packed bed and reacts to form a ZrB2-ZrC (40) composite or the same boride-carbide precipitates embedded in a Zr matrix. Determine the mass of Zr giving you 20% excess by weight in the metal matrix. D. Hafnium melt contained in a graphite or carbon crucible (0.5 cm thick and 5 cm diameter) reacts to form an internal layer of HIC at the liquid Hf/C interface. The carbon seems to diffuse through the HIC at 20 m /sos and 7 m/sos at 2300°C and 1800°C, respectively. If the melt/HfC/C system reaches a temperature of 3200°C what will be the anticipated diffusion coefficient of carbon in m2ls? If possible, determine the activation energy for the diffusion of C in HfC. At 3200°C, will the thickness of HfC fill completely the internal region of the graphite crucible in eight hours, if we assume that the HfC forms as soon as the carbon contacts the liquid Hf. Niobium is added to liquid Hf to produce an Hf-10 wt%No alloy. Upon heating to 2000°C, an oxide forms on the surface. If the elemental ccmponents oxidize ideally, what is the expected composition of the HfO2-Nb2Os oxide? (50) E. (30) F. (30)

Explanation / Answer

A.Beta -titanium exhibit the BCC allotropic form of titanium.Elements used in this alloys are one or more of the titanium in varying amounts.These are molybdenum,vanadium,niobium,tantalum,zirconium,manganese,iron,chromium,cobnalt,nickel,and coper

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