本文選題：鎢鎳鐵　切入點(diǎn)：高比重合金　出處：《稀有金屬》2017年01期

【摘要】：鎢基高比重合金在航天航空、兵器等行業(yè)中有著廣泛應(yīng)用,但傳統(tǒng)鎢鎳鐵高比重合金需通過后續(xù)形變強(qiáng)化處理提高力學(xué)性能,限制了其在國防工業(yè)和民用領(lǐng)域的廣泛應(yīng)用。利用彌散強(qiáng)化手段,當(dāng)強(qiáng)化相在基體內(nèi)呈彌散質(zhì)點(diǎn)或粒狀分布時(shí),可顯著提高合金強(qiáng)度和硬度,且塑性和韌性下降不大。本文研究了Y_2O_3彌散強(qiáng)化95W-3.5Ni-1.5Fe合金的制備工藝及性能。與傳統(tǒng)鎢鎳鐵高比重合金制備相比,本文首先利用化學(xué)氣相遷移機(jī)制制備Y_2O_3分布在顆粒內(nèi)部的彌散強(qiáng)化鎢粉,重點(diǎn)研究原料種類對彌散強(qiáng)化鎢粉粒度的影響以及成形、燒結(jié)工藝,利用X射線衍射(XRD)分析、場發(fā)射掃描電子顯微鏡(FESEM)對彌散強(qiáng)化鎢粉及彌散強(qiáng)化鎢進(jìn)行性能表征。結(jié)果表明:WO2.9+Y_2O_3體系制備的彌散強(qiáng)化鎢粉粒度最小,約1μm;經(jīng)1480℃燒結(jié)90 min,彌散強(qiáng)化鎢鎳鐵高比重合金的相對密度達(dá)98.6%,Y_2O_3在鎢晶粒內(nèi)呈彌散分布;鎢合金的顯微硬度達(dá)HV 532,表現(xiàn)出較高韌性。
[Abstract]:Tungsten based high specific gravity alloys are widely used in aerospace and weapon industries, but the traditional tungsten nickel iron high gravity alloys need to improve their mechanical properties through subsequent deformation strengthening treatment, which limits their wide application in national defense industry and civil fields.By means of dispersion strengthening, the strength and hardness of the alloy can be significantly increased when the strengthening phase is dispersed or granular in the matrix, and the ductility and toughness of the alloy are not much decreased.The preparation process and properties of Y_2O_3 dispersion-strengthened 95W-3.5Ni-1.5Fe alloy were studied in this paper.Compared with the traditional high specific gravity tungsten nickel iron alloy, in this paper, we first use the chemical vapor migration mechanism to prepare the dispersion strengthened tungsten powder with Y_2O_3 distribution inside the particle, focusing on the influence of the raw materials on the particle size and the forming of the dispersion strengthened tungsten powder.The properties of dispersion-enhanced tungsten powder and diffusion-enhanced tungsten powder were characterized by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD) analysis.The results show that the particle size of dispersion-strengthened tungsten powder prepared by Y_2O_3 system is the smallest, about 1 渭 m, and the relative density of dispersion-strengthened Ni-Ni-Fe high gravity alloy is 98.6% after sintering at 1480 鈩，

本文編號：1728316