A Composite Diffraction Method for Determining the Optimal Orientation of FCC-Zr Phases in Zirconium Alloys by TEM
An optimal direction, zirconium alloy technology, applied in the field of composite diffraction method, can solve the problems of complex analysis, confusion, inconvenience, etc., and achieve the effect of improving test efficiency, simple classification, and saving test costs.
Active Publication Date: 2021-11-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
If there are twins in the matrix, such as {10-12} and {10-11} twins common in α-Zr, then the analysis of the electron diffraction spectrum of the alloy will become extremely complicated, and the morphology of FCC-Zr is also Similar to twins, so they will be confused with each other, causing misjudgment
It has caused great inconvenience to the development of related research
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Embodiment 1
[0044] The matrix phase of Zr-4 alloy is HCP-Zr phase with HCP structure, and its unit cell parameters are a=0.3427n, c=0.5577nm; the unit cell parameter of FCC-Zr phase in the alloy is measured as a=0.493nm. It is found that there are generally two orientation relationships between the FCC-Zr phase and the matrix. According to the crystal plane relationship between the two-phase interface and the matrix α-Zr phase, they are respectively named as ① FCC-Zr phase with B-type orientation relationship: HCP / / FCC ,{0001} HCP / / {1-11} FCC ;② FCC-Zr phase with P-type orientation relationship: HCP / / FCC ,{10-10} HCP / / {220} FCC . In order to determine the best electron beam incidence direction of B-type and P-type FCC-Zr phases in Zr-4 alloys by TEM observation, a composite spot diffraction method of the present invention is used to determine the best observation directions of FCC-Zr phases in zirconium alloys method, the specific steps are as follows:
[0045] (1) Select...
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The purpose of the present invention is to provide a composite diffraction method for determining the optimum direction of the FCC-Zr phase in TEM observation of zirconium alloys. Firstly, according to the possible directional relationship between the two phases, the matrix operation is used to obtain the corresponding relationship between the crystal plane index and the crystal orientation index between FCC-Zr and the matrix; The two-phase composite spot diffraction spectrum under the electron beam; finally, by comparing the two-phase composite diffraction spectra under different incident directions, the electron beam incident direction corresponding to the corresponding low-index crystallographic direction and crystal plane index is the best way to observe the FCC‑Zr phase. good direction. The method of the invention can accurately find and observe the optimal electron beam incident direction of the nano-sized FCC-Zr phase in the zirconium alloy, which is of great significance for the research of FCC-Zr crystallography.
Description
technical field [0001] This paper relates to a composite diffraction method for determining the FCC-Zr phase in zirconium alloys observed by TEM, and specifically relates to the fields of zirconium alloy crystallography and transmission electron microscopy. Background technique [0002] Similar to titanium (Ti) and hafnium (Hf) in group IV of the periodic table, generally speaking, there are two stable phase structures in zirconium (Zr), namely the low-temperature hexagonal close-packed α-Zr phase and the high-temperature phase β-Zr phase with heart cubic structure. In recent years, studies have found that there is also a face-centered cubic structure FCC-Zr phase in zirconium and zirconium alloys, and its stability is between the α-Zr phase and the β-Zr phase, which is a metastable phase. The FCC-Zr phase in zirconium and zirconium alloys is generally needle-shaped, with a width of less than 100 nm and a length of several microns. Due to its small size, it is difficult to...
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IPC IPC(8): G01N23/20058
CPCG01N23/20
Inventor 李阁平韩福洲刘承泽袁福森张英东郭文斌阿里·穆罕默德顾恒飞
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI