| 摘要: |
| 为分析Fe17Mn5Si10Cr5Ni形状记忆合金（SMA）电阻率与奥氏体（γ）→ε马氏体相变及其逆相变的关系，通过动态电阻测量系统、X射线衍射（XRD）、金相显微镜等，观测拉伸和加热过程中SMA电阻率、物相组成和显微组织的变化.结果表明：在0%~7.0%拉伸应变过程中，SMA电阻率随着拉伸应变的增加而增大；在γ→ε马氏体相变期间，SMA电阻率的增幅变大，且与ε马氏体含量的变化规律保持一致；5.0%拉伸应变的SMA试样在加热及冷却过程中，其电阻率与温度成正相关关系；在γ→ε马氏体逆相变期间，SMA电阻率的增幅随着ε马氏体含量的减少而变小. |
| 关键词: Fe-Mn-Si记忆合金 电阻率 γ→ε马氏体正逆相变 |
| DOI：10.3969/j.issn.1007-9629.2021.05.022 |
| 分类号:TG139+.6 |
| 基金项目:国家自然科学基金资助项目（51879026，51709029）；中央高校基本科研业务费专项（3132019308） |
|
| Resistivity Characteristics of Fe-Mn-Si Shape Memory Alloy |
|
SUN Deping1, JU Heng2, SONG Liguo1, YUAN Haichao1, Lü Yuqi1
|
|
1.Marine Engineering College， Dalian Maritime University， Dalian 116026， China;2.Mechanical and Power Engineering College， Dalian Ocean University， Dalian 116023， China
|
| Abstract: |
| In order to analyze the internal relationship between the resistivity of Fe-Mn-Si shape memory alloy（SMA） and the austenite（γ）→ε martensite phase transformation and its reverse transformation， means of dynamic resistance measurement system， X-ray diffraction（XRD）， metallographic microscope and other methods were used to measure and observe the resistivity， phase composition and microstructure of Fe-Mn-Si memory alloy during tensile and heating process. The test results show that during the 0%-7.0% tensile strain of the Fe17Mn5Si10Cr5Ni memory alloy， the resistivity of the alloy increases with the increase of the tensile strain. During the γ→ε martensite phase transformation， the increase range of resistivity increases， and is consistent with the change law of the content of ε martensite. During the heating and cooling process of the 5.0% tensile strained Fe17Mn5Si10Cr5Ni memory alloy sample， the alloy resistivity has a positive correlation with temperature. During the γ→ε martensite reverse phase transformation， the increase range of the alloy resistivity decreases as the content of ε martensite decreases. |
| Key words: Fe-Mn-Si shape memory alloy resistivity γ→ε martensite and reverse phase transformation |
