吳標(biāo)理1，陳小麗1， 王花賓1
( 1. 中南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410083；
2. 同濟(jì)大學(xué) 材料科學(xué)與工程學(xué)院， 上海 200050)
摘 要: 采用機(jī)械合金化（MA）以及低溫高壓燒結(jié)工藝制備了Fe84Nb7B9軟磁合金粉末及其塊體合金， 并利用XRD、 DSC、 SEM對MA合金粉末和塊體合金的相結(jié)構(gòu)、 晶粒大小以及組織的熱穩(wěn)定性進(jìn)行了研究。 結(jié)果表明： 經(jīng)過15h MA后， 可獲得單相bcc結(jié)構(gòu)的粒徑小于10nm的納米晶過飽和固溶體粉末； 在常壓狀態(tài)下， 單相納米晶過飽和固溶體合金在溫度小于550℃時(shí)具有良好的組織熱穩(wěn)定性， 溫度小于770℃時(shí)具有良好的相熱穩(wěn)定性； 在p=5.5GPa, t=3min條件下, 當(dāng)Pw≥820W時(shí)， 可獲得相對密度大于98.4%、 單相bcc結(jié)構(gòu)的納米晶（粒徑小于10nm）塊體合金。
關(guān)鍵字: Fe基軟磁合金； MA； 高壓成型； 塊體材料； 納米晶
magnetic bulk alloy under high-pressure
LIU Hui-qun1, WU Biao-li1, CHEN Xiao-li1, WANG Hua-bin1
（ 1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. Institute of Materials Science and Engineering,
Tongji University, Shanghai 200050, China）
Abstract: Fe84Nb7B9 soft magnetic powders and bulk alloys were prepared by MA and low-temperature high-pressure sintering process, respectively. Phase structure, grain size and thermal stability of microstructure in MA powders and bulk alloys were studied by XRD, DSC and SEM. After MA for 15h, nanocrystalline(less than 10nm) supersaturated solid solution powders of single phase with bcc structure can be obtained. Under normal pressure, single phase nanocrystalline supersaturated solid solution alloys show excellent microstructure thermal stability and phase thermal stability at temperature being less than 550, 770℃, respectively; and under the conditions of p=5.5GPa, t=3min, when Pw≥820W, single phase bcc nanocrystalline(less than 10nm) bulk alloys, which has relative density of more than 98.4%, can be obtained.
Key words: Fe based soft magnetic alloys; MA; high-pressure forming; bulk; nanocrystalline
