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Chemical composition on mechanical properties of Ni-Mo alloy and the ordering behavior

Times the sample in l000 ℃, l000h exposure, only M4Mo ordered phase. A furnace electron diffraction also confirmed the formation of the ordered phase is the second Ni4M0,[link widoczny dla zalogowanych], observed characteristics of Nj4Mo the Dla superlattice reflection. Dark field image shows the matrix of Nj4M0 established along the face-centered aspects of deformation twins mosaic form of goods. But, however, cabins, sharp, in the goods sector has a discontinuous reaction products sector,[link widoczny dla zalogowanych], resulting in a fine lamellar structure of the Ni4Mo. In contrast, the furnace the sample is Ni4Mo ∞ la super-lattice) and on the crystallography associated with Ni3Mo D022 superlattice structure based f) Composition of mixed units. Dla and DO22 superlattice disorder may be from the last to be face-centered cubic lattice of atoms in {420) surface to rearrange the face-centered come. Dla superlattice (NinMo), only every fifth plane into possession of aluminum atoms,[link widoczny dla zalogowanych], but only between the molybdenum atoms of nickel surface atoms,[link widoczny dla zalogowanych], in the 115 (,[link widoczny dla zalogowanych], 420) fcc & produce its characteristic superlattice reflections. DO22 superlattice only every fourth plane into possession of molybdenum atoms in the l <420) fee & produced superlattice reflection. Ordered according to a theory of disorder in the {100} fee, f】 1 / 20} fcc ~ {11O) fcc positions have characteristic reflection DO22,, in the long-range order of the period to Ni4Mo and Ni3Mo may be asked to avoid the formation of Bo Mei. In the Ni-Mo Taijin ordering accompanied with the 4Mo intergranular embrittlement may be ordered discontinuous grain boundary reaction. Early studies pointed out: with the grain in an orderly than the contingency sister, due to spontaneous or strain-induced recrystallization occurred in the grain boundary discontinuous Shuo and orderly response to myeloid be minimal. DIa sample in the furnace and the DO22 superlattice may be reduced simultaneously with the right ordering of the intragranular strain energy, thereby inhibiting the grain boundary response, at least in part, explain the retention of high ductility. X-ray diffraction and electron diffraction showed that, 'OO ℃, 1 ∞ oh two heats exposed stone materials as appropriate'. 'The formation of the ordered phase is NiM0. Chad t'800 ℃, l000h maintained after exposure Ni4Mo furnace material as the only ordered phase, and at 600 ℃ and 700 ℃ exposure compared to no place in the grain boundary is not continuous and orderly response, which may explain to maintain high plasticity after exposure at 1000h. This difference may be related to temperature on the atomic migration and the number of nucleation sites on. High rate of volume diffusion at high temperatures, nucleation points, is conducive to the matrix deposition. Lower temperatures reduce the rate of volume diffusion, grain boundary precipitation is obvious. And furnace materials 8o0 ℃ preserved when exposed to the sheet of precipitation and Ni4Mo relevant, Ni3Mo particularly hard and Chuai film. If the mouth of furnace materials like molybdenum concentration of the same binary Ni-Mo Taijin as to form a Ni4Mo ordered phase only, and will not be Ni3Mo. X-ray diffraction shows that, 3Mo obvious in the two elements iron and chromium, and their concentration is very low even when there is a steady Ni3Mo role. Ni-Mo Taijin pan heats between the changes in mechanical properties and chemical composition different from Taiwan's long-range order payment behavior of the right clearance. For a given concentration of iron and chromium, B2 ordering behavior of alloy for different aluminum concentrations may significantly deviate from the binary Ni-Mo Taijin. Taijin molybdenum content increases the formation of the ordered phase will Taijin changed by the Ni4Mo Ni3Mo. (Huang Hanliang) a production of high purity electrolytic refining molten metal tantalum, It's an effective method of hafnium and scandium Wang sickle sticks the continuous progress of science and technology, requires better methods of enamel is usually divided into chemical and physical chemical j strike. Process for the afterlife as thin J pure materials. 4O years in the 20th century, soil, lead, thorium, Pei, niobium and tantalum that some of the negative charge of the payment system of the limited material obtained total concentration level of impurity is on the basket, escaped with the ultra low voltage, the current system to take 10at% -10 A at%, while the total content of impurities present grant to high purity metal. The only acceptable solution is refined salt Tuen, 0 a at% ~ lO-6at%. 7O were analyzed by a single solid-refining method. As noted above, tantalum, hafnium and scandium is the high purity metal in the purity of pure substances bug results, one of the most impure metal the worst degree of a class. Therefore, these metals refining, by the cut is the flag of the periodic table Ⅲ and r, deputy group of the metal. Maximum total of its chemical properties and similarity of some metals (tantalum and impurities 0.33at% each, and 0l32at%. These metal niobium. Hafnium and Pei, scandium and rare earth element cable); and ask gap is the rare earth impurities. Tantalum, words and wrong. The current production of high purity metal side (oxygen 氲) reasons, the purification of dog care experience is very sleepy I】 * l

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