Supercharge Your Innovation With Domain-Expert AI Agents!

Determination method of pure phase change enthalpy of martensite in copper-based memory alloy

A technology of memory alloy and measurement method, which is applied in the field of measurement of pure phase change enthalpy of copper-based memory alloy martensite. simplified effect

Inactive Publication Date: 2018-10-09
SHANDONG UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the current routine experiment is concerned, only the total phase change enthalpy can be obtained, and the pure phase change enthalpy cannot be obtained separately

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the assay method of copper-based memory alloy martensite pure phase change enthalpy, comprises the following steps:

[0025] In the first step, place the packaged sample and the standard sample on the sample stages facing the left and right sides of the differential scanning calorimeter respectively;

[0026] The second step is to replace the DSC furnace body with a low-temperature furnace body that can add liquid cooling medium;

[0027] The 3rd step, adopt the method for rapid heating to determine the end temperature Af of copper-based memory alloy to parent phase transformation, adopt the method for rapid cooling to determine the end temperature Mf of copper-based memory alloy by parent phase transformation to martensite;

[0028] The fourth step is to determine the temperature range of rapid heating and sub-ultra-low cooling;

[0029] The fifth step is to set the rapid heating and sub-ultra-low speed cooling procedures according to the temperature ran...

Embodiment 2

[0043] Embodiment 2: the assay method of copper-based memory alloy martensite pure phase change enthalpy, comprises the following steps:

[0044] In the first step, place the packaged sample and the standard sample on the sample stages facing the left and right sides of the differential scanning calorimeter respectively;

[0045] The second step is to replace the DSC furnace body with a low-temperature furnace body that can add liquid cooling medium;

[0046] The 3rd step, adopt the method for rapid heating to determine the end temperature Af of copper-based memory alloy to parent phase transformation, adopt the method for rapid cooling to determine the end temperature Mf of copper-based memory alloy by parent phase transformation to martensite;

[0047] The fourth step is to determine the temperature range of rapid heating and sub-ultra-low cooling;

[0048] The fifth step is to set the rapid heating and sub-ultra-low speed cooling procedures according to the temperature ran...

Embodiment 3

[0056] Embodiment 3: the assay method of copper-based memory alloy martensite pure phase change enthalpy, comprises the following steps:

[0057] In the first step, place the packaged sample and the standard sample on the sample stages facing the left and right sides of the differential scanning calorimeter respectively;

[0058] The second step is to replace the DSC furnace body with a low-temperature furnace body that can add liquid cooling medium;

[0059] The 3rd step, adopt the method for rapid heating to determine the end temperature Af of copper-based memory alloy to parent phase transformation, adopt the method for rapid cooling to determine the end temperature Mf of copper-based memory alloy by parent phase transformation to martensite;

[0060] The fourth step is to determine the temperature range of rapid heating and sub-ultra-low cooling;

[0061] The fifth step is to set the rapid heating and sub-ultra-low speed cooling procedures according to the temperature ran...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for determining pure phase change enthalpy of a copper-based memory alloy martensite. The method includes the following steps that 1, the end temperature Af of transformation towards a parent phase and the end temperature Mf of transformation from the parent phase to the martensite of a copper-based memory alloy sample are firstly detected by utilizing a differential scanning calorimetry analyzer; 2, secondary rapid heating and ultra-low-speed sub-cooling are performed, the end temperature of the transformation towards the parent phase of the copper-based memory alloy sample during rapid heating is Af + 5 DEG C-Af + 10 DEG C, the starting temperature of ultra-low-speed sub-cooling is Af + 5 DEG C-Af + 10 DEG C, the end temperature of ultra-low-speed sub-cooling is Mf +10 DEG C-Mf +15 DEG C, and the sum of the right side small peak areas in peaks scanned in the ultra-low-speed sub-cooling process is the pure phase change enthalpy. According to the method, the mode that the total phase-change enthalpy and a heat capacity change enthalpy are firstly and respectively calculated and then a method for subtracting the heat capacity change enthalpy from total phase-change enthalpy is utilized to calculate the pure phase change enthalpy is not needed, a pure phase change enthalpy value can be directly obtained by creatively determining the temperature range of the ultra-low-speed sub-cooling, and the operating process can be made more simplified, quicker and more convenient.

Description

technical field [0001] The invention specifically relates to a method for measuring the pure phase change enthalpy of copper-based memory alloy martensite. Background technique [0002] For copper-based shape memory alloys, cooling from the parent phase state, when the temperature reaches the starting temperature Ms of the parent phase to martensitic transformation, it will transform from one phase state to another, that is, from the parent phase What is the pure phase change enthalpy for the phase transformation into martensitic phase? And how to conduct differential scanning calorimetry (DSC) experiments to directly obtain pure phase change enthalpy? Judging from the current situation, there is no mature experimental method, so it is an urgent experimental method and technical problem to be solved. As far as the current routine experiment is concerned, only the total phase change enthalpy can be obtained, and the pure phase change enthalpy cannot be obtained alone. Ther...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/12G01N25/20
CPCG01N25/12G01N25/20
Inventor 白玉俊耿贵立
Owner SHANDONG UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com