有序化熱處理對Ni-Mn-Ga-Fe 形狀記憶纖維的影響

有序化熱處理對Ni-Mn-Ga-Fe 形狀記憶纖維的影響Effect of chemical ordering annealing on Ni-Mn-Ga-Fe shape memory microwires

通過熔體抽拉法制備了直徑為40~50 μm、長度為5~10 cm的多晶Ni50Mn25Ga25-xFex (x=1, 2, 3, 4, 5, 6, 摩爾分?jǐn)?shù)，%)纖維，對制備態(tài)纖維采用步進(jìn)式有序化后熱處理，利用場發(fā)射掃描電子顯微鏡、透射電子顯微鏡、X射線衍射對其微觀組織和成分進(jìn)行表征，使用差示掃描量熱分析儀和動(dòng)態(tài)機(jī)械拉伸儀測試其相變行為和力學(xué)性能。結(jié)果表明：熱處理后隨著Fe摻雜的增加，纖維實(shí)現(xiàn)了從奧氏體相到馬氏體相的轉(zhuǎn)變，熱處理態(tài)纖維具有不同的晶體類型，馬氏體孿晶界更為平直、清晰，原子有序度明顯提高。熱處理可以提高相變溫度，減小相變滯后，使馬氏體相變更容易進(jìn)行，提高了抗拉強(qiáng)度和斷裂應(yīng)變。綜合分析闡明了Fe摻雜及有序化熱處理影響微觀結(jié)構(gòu)、相變行為和力學(xué)性能的微觀機(jī)制。

The polycrystalline Ni50Mn25Ga25-xFex (x=1, 2, 3, 4, 5, 6, mole fraction, %) microwires with diameter of 40- 50 μm and length of 5-10 cm were prepared by meld extraction technique. A step-wise chemical ordering annealing heat treatment was carried out. The microstructure and composition of microwires were characterized using field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometry (XRD). The phase transition behavior and mechanical properties were tested using differential scanning calorimetry (DSC) and dynamic mechanical analyzer (DMA). The results show that, after heat treatment along with the increase of the Fe doped, the microwires have realized from the austenite phase to the martensite phase transformation. The annealed microwires have different crystal types, the martensite exhibits straight clear twin boundary, and the atomic ordering increases. The annealing increases the transformation temperature and decreases the transformation hysteresis, and makes martensite transition easier. The annealing improves the tensile strength and breaking strain. Comprehensive analysis illustrates that the microcosmic mechanisms of Fe doping and ordering heat treatment affect the microstructure, phase transition behavior and mechanical properties.

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