Amorphous Alloy Temperature Field Calibration via Crystallization Time
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Solution Overview
Problem
Conventional methods for calibrating the internal temperature field of amorphous alloys prepared by spark plasma sintering are inaccurate and cumbersome, as they either disrupt the temperature distribution with thermocouple insertion or provide only qualitative analysis through microstructure observation, which is not suitable for amorphous alloys without grains or phase transitions.
Innovation Solution
A method involving sintering amorphous alloy powder into bulk samples, cutting them into sub-blocks, subjecting them to isothermal crystallization, and constructing a functional relationship between annealing temperature and crystallization time to indirectly obtain the internal temperature field distribution without affecting the original temperature field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If thermocouples are inserted to directly measure temperature, then temperature measurement capability is improved, but the temperature distribution is disturbed and measurement accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary substance (amorphous alloy material itself) that serves as both the object of study and the measurement medium. By utilizing the material's inherent crystallization characteristics and applying differential scanning calorimetry, the temperature field is measured indirectly through thermal effects, avoiding direct thermocouple insertion that would disturb the temperature distribution.
Solution Approach 2:
The patent replaces the mechanical insertion method (thermocouples) with a thermal analysis method (differential scanning calorimetry). Instead of mechanically inserting sensors that disturb the system, the method uses thermal measurement principles to detect temperature distribution through the material's crystallization behavior, substituting mechanical measurement with thermal field measurement.
2Loss of information
If microstructure observation is used to analyze temperature distribution, then qualitative analysis capability is improved, but quantitative measurement capability deteriorates
Solution Approach 1:
The patent utilizes the phase transition characteristics of amorphous alloys (crystallization from amorphous to crystalline state) as a temperature indicator. By measuring the crystallization temperature and analyzing the thermal effects during phase transition using differential scanning calorimetry, the method converts qualitative microstructure observations into quantitative temperature measurements based on the material's inherent phase transition behavior at specific temperatures.
3Measurement precision
If sample is cut into sub-blocks for analysis, then temperature field calibration capability is improved, but sample integrity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the bulk amorphous alloy sample into multiple sub-blocks from different spatial positions. Each sub-block is then independently analyzed using differential scanning calorimetry to determine its crystallization temperature and thermal history. This segmentation enables spatial mapping of the temperature field, with each segment providing localized temperature calibration data that collectively reconstructs the overall temperature distribution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for accurate, non-invasive calibration of the internal temperature field, providing numerical distribution of sintering temperatures with high conformity to simulation results and applicability, avoiding the limitations of traditional methods.
Implementation Method 1
The several amorphous alloy sub-blocks obtained in step (2) are respectively subjected to isothermal crystallization treatment at the same holding temperature to obtain the crystallization time of each amorphous alloy sub-block
Implementation Method 2
Annealing and isothermal crystallization are performed on the amorphous alloy powder used in the preparation of the bulk amorphous alloy sample at different annealing temperatures, so as to obtain the corresponding crystallization time of the amorphous alloy powder at different annealing temperatures
Data Source
AI summary
The invention belongs to the field of amorphous alloys, and more specifically, relates to a method for calibrating the internal temperature field of amorphous alloy prepared by spark plasma sintering. First, the part required for temperature field calibration inside the bulk amorphous alloy sample obtained by spark plasma sintering is cut into a series of small amorphous alloy samples, and the isothermal crystallization treatment is performed to obtain the crystallization time of different parts of the sample. An annealing-isothermal crystallization experiment is performed on the adopted amorphous alloy powder at different annealing temperatures, and the functional relationship between the annealing temperature and the crystallization time is obtained. The crystallization time of different parts inside the amorphous alloy sample is substituted into this functional relationship, the temperature distribution during the temperature holding stage during the sintering of different parts inside the amorphous alloy sample can be obtained.