【摘要】：本文利用原子力顯微鏡原位研究Mn79.5Fe15.6Cu4.9反鐵磁高溫形狀記憶合金在升降溫過程中與馬氏體相變相關(guān)的表面起伏特征,同時采用X射線衍射、動態(tài)熱機械分析等實驗檢測手段輔助分析其微觀組織結(jié)構(gòu)演化,從納米尺度分析面心立方—面心四方結(jié)構(gòu)相變及表面浮突產(chǎn)生的物理機理.實驗結(jié)果表明:在升降溫過程中觀察到帳篷型表面浮突,由面心立方—面心四方馬氏體逆相變產(chǎn)生的,即母相浮突,這與通常觀測到的馬氏體浮突不同;實驗證實面心立方—面心四方馬氏體逆相變具有切變特征,馬氏體孿晶的逆向切變是產(chǎn)生帳篷型表面浮突的主要機理;測得逆孿晶切變的浮突角小于1?,遠小于傳統(tǒng)形狀記憶合金的表面浮突角值,這是由于面心立方母相與面心四方馬氏體相結(jié)構(gòu)差異較小造成的;表面浮突隨溫度變化具有極好的可逆性,這是馬氏體相變晶體學可逆性決定的,表明該合金具有優(yōu)良的表面形貌記憶效應(yīng).
[Abstract]:In this paper, the surface fluctuation characteristics of Mn79.5Fe15.6Cu4.9 antiferromagnetic high temperature shape memory alloy associated with martensite transformation are studied in situ by atomic force microscope (AFM). At the same time, X-ray diffraction is used. Dynamic thermo-mechanical analysis and other experimental methods are used to analyze the microstructure evolution. The physical mechanism of the phase transition and surface floatation is analyzed from the nanometer scale. The experimental results show that the tent surface floatation is caused by the inverse transformation of face-centered cubic tetragonal martensite, that is, the parent phase floatation, which is different from the usual observed martensite floatation. Experimental results show that the inverse transformation of face-centered cubic tetragonal martensite has shear characteristics, and the reverse shear of martensite twin is the main mechanism for the formation of tent surface floatation. It is found that the floating angle of inverse twin shear is less than 1g, which is much smaller than the surface floatation angle of the traditional shape memory alloy, which is due to the small difference between the face-centered cubic parent phase and the face-centered tetragonal martensite phase. The surface floatation has excellent reversibility with temperature, which is determined by the crystallographic reversibility of martensite transformation, which indicates that the alloy has excellent surface morphology memory effect.
【作者單位】： 上海交通大學材料科學與工程學院;
【基金】：國家自然科學基金(批準號:51171112) 國家重點基礎(chǔ)研究發(fā)展計劃(973項目)(批準號:2012CB619400) 教育部國家級大學生創(chuàng)新創(chuàng)業(yè)訓練計劃項目(批準號:201310248037)資助的課題~~
【分類號】：TG139.6

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