TZM alloy

The US Bureau of Mines found the chemical and galvanic corrosion behaviour of both the TZM and Mo-30W alloy to be generally equal or superior to that of unalloyed molybdenum in many aqueous solutions of acids, bases and salts. Notable exceptions occurred in 6-1 % nitric acid where both alloys corroded appreciably faster than molybdenum. In mercuric chloride solutions the TZM alloy was susceptible to a type of crevice corrosion which was not due to differential aeration. The alloys were usually not adversely affected by contact with dissimilar metals in galvanic couple experiments, but the dissimilar metals sometimes corroded galvanically. Both alloys were resistant to synthetic sea water spray at 60°C. 

Titanium white pigments, commercial production of, 19 388 Titanium white rutile pigment, 19 391 Titanium zinc oxide, 5 603 Titanium-zirconium-molybdenum (TZM) alloy, 17 14-15 Titanocene, 25 118 Titanocene catalysts, 16 19 Titanocene dichloride, 25 105 Titanocene synthons, 25 116 Titanocycles, 25 116... 

FI.J. Shi, L. S. Niu, C. Korn, G. Pluvinage Fligh temperature fatigue behavior of Mo-TZM alloy under mechanical and thermomechanical cyclic load, J. Nuclear Mat. 278, 328 (2000)... 

Additions of selected alloying elements raise the recrystaUization temperature, extending to higher temperature regimes the tensile properties of the cold-worked molybdenum metal. The simultaneous additions of 0.5% titanium and 0.1% zirconium produce the TZM aUoy, which has a corresponding... 

An alloy of molybdenum containing 1.2% hafnium with carbon at the level of 0.08—0.10% has a slight advantage over TZM. This alloy has been produced in small quantities for special extmsion dies and ejector pins in the isothermal forging of superalloys. 

Unalloyed molybdenum is available commercially in almost all forms, from forging billets and plate to seamless tubing, foil and wire. In addition, the following molybdenum-base alloys can be considered as established engineering materials Mo-0-5Ti-0-8Zr (designated TZM) and Mo-30W. A Mo-30Ta alloy has also been produced for specific applications where high corrosion resistance is required. 

Alloys Ti-6A1-4V, V-20Ti, TZM, Nb-1 Zr, 316SS, Al-6061. This is an illustrative list. b Materials in parenthesis are unacceptable with stated coolant. c Stainless Steel. 

Multitube furnaces (14 to 18 tubes arranged in two rows) are frequently in use today. A photograph of an industrial aggregate is shown in Fig. 5.26. The boat material, in most cases, is an iron alloy high in Ni and Cr (Inconel). More seldom, because of the high price, boats are made of TZM (molybdenum alloy with Ti, Zr, and C) or pure tungsten. 

Ervin DR, Bourell DL, Persad C, Rabenberg L (1988) Stmcture and properties of high-eneigy, high-rate consolidated molybdenum alloy TZM. Mater Sci Eng A-Stmct Mater Prop Microstract Process 102 25-30... 

Carbide precipitation hardening (in TZM, MHC) is effective up to 1400 °C. The addition of the deformable oxides La203 (in ML) and xKqO y Si02 (in K—Si—Mo), respectively, results in oxide refinement by deformation and in the possibility of tailoring the mechanical properties. This is the main alloying mechanism for Mo applied in lamps [1.119]. 

The coefficient of linear thermal expansion, the thermal conductivity, the specific heat, and the electrical resistivity as function of temperature are shown in Figs. 3.1-140-3.1-143. The vapor pressure and rate of evaporation are shown in Fig. 3.1-144. In the case of precipitation- and dispersion-strengthened molybdenum alloys, such as TZM, MHC, ML, MY, and K—Si—Mo,... 

For comparison, the high-temperature strength of stress-relieved 1-mm sheets made of Mo- and W-hased materials is shown in Fig. 3.1-166. For short-term appUcation under high stresses, the precipitation-strengthened Mo alloys TZM and MHC offer the hest performance up to a service temperature of 1500 °C. For higher temperatures, W-hased materials should he applied. Tantalum-based alloys are used only if additional high ductility is required after cooling to room temperature. 

Electro- chemical cleaning 80 wt.% cone. HjSO, 55 This method is generally performed for molybdenum alloy TZM. The recommended procedure is (i) solvent degreasing for 10 min, (ii) immersion in a commercial alkaline cleaner for 2 to 3 min, (iii) rinsing with cold water, (iv) buff and vapor blasting, (v) second immersion in a commercial alkaline cleaner, (vi) rinsing with cold water, (vii) electrochemical polishing with molybdenum workpiece polarized anodically at a current density of 50 A/m ... 

Active-brazed joint between graphite and a TZM molybdennni alloy (see Tables 44-60 and Figs. 101-134). 

Figure 102. Laminar composite of graphite/AgCuTi braze/TZM molybdenum alloy. Micro-structural imaging by various methods of contrast enhancement.

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