【摘要】：寬過冷液相區(qū)的非晶合金是一種新材料,具有優(yōu)異的機(jī)械性能與獨(dú)特的功能特性,是國內(nèi)外材料科學(xué)與工程領(lǐng)域研究的熱點(diǎn)問題之一。而Fe基非晶合金不但具有優(yōu)良的力學(xué)性能,還具有優(yōu)異的軟磁性能,存在廣闊的應(yīng)用前景。本文以Fe60Cr15Mn10N15多元非晶合金為研究對象,采用XRD、SEM、DSC、VSM等研究了Fe60Cr15Mn10N15非晶合金的MA形成過程、非晶的退火轉(zhuǎn)變以及其磁性能。研究結(jié)果表明：采用MA經(jīng)40小時球磨可以制備Fe60Cr15Mn10N15非晶合金,其玻璃轉(zhuǎn)變溫度Tg=437℃,晶化溫度Tx=519℃過冷液相區(qū)寬度△Tx=82℃；延長球磨時間,非晶合金開始析出Cr2N晶體相；球磨過程中,粉體組織演變過程為：混合粉體→過飽和固溶體+Cr2N→非晶合金→非晶合金+Cr2N；熱力學(xué)計算表明Fe60Cr15Mn10N15多元非晶合金體系的化學(xué)混合焓ΔHchem=-0.24KJ/mol,非晶形成焓ΔHform=-6.610KJ/mol,說明該成分合金滿足形成非晶的熱力學(xué)條件；采用8%Mo元素替換Cr元素,球磨120h后,仍具有較強(qiáng)的Mo峰存在；采用7%B元素替換N元素,球磨120h,仍具有較強(qiáng)的Cr2N峰存在；Fe60Cr15Mn10N15非晶合金粉末差熱分析時,隨加熱速度的增加,其特征溫度均向高溫方向移動,具有明顯的動力學(xué)效應(yīng),擬合的Kissinger方程得出該非晶合金的表觀激活能分別為：Eg=117.75kJ/mol和Ex1=129.56kJ/mol;通過Losocka方程擬合得到Kauzmann溫度為Tk=127K;對Fe60Cr15Mn10N15非晶合金的等溫退火表明其晶化過程中組織演變過程為：非晶合金→非晶合金+Cr2N→α-Fe+Cr2N→α-Fe+CrN+Cr2N; Fe60Cr15Mn10N15合金體系在球磨過程中和不同溫度等溫退火后都呈現(xiàn)出優(yōu)良的軟磁性能,兩者的軟磁性能變化都是隨著非晶含量的增加而提高,隨晶體相的增多而下降,全非晶態(tài)時Fe60Cr15Mn10N15綜合軟磁性能最優(yōu)。
[Abstract]:Amorphous alloy with wide undercooled liquid region is a new material with excellent mechanical properties and unique functional properties. It is one of the hot issues in the field of material science and engineering at home and abroad. Fe based amorphous alloys not only have excellent mechanical properties, but also have excellent soft magnetic properties. In this paper, the formation process of MA, annealing transformation and magnetic properties of Fe60Cr15Mn10N15 amorphous alloy were studied by XRD,SEM,DSC,VSM. The results show that the Fe60Cr15Mn10N15 amorphous alloy can be prepared by 40 hours ball milling with MA. The glass transition temperature is Tg=437 鈩，

本文編號：2382699