機(jī)械合金化—放電等離子燒結(jié)原位制備納米晶Al-Fe復(fù)合材料
發(fā)布時(shí)間：2019-04-09 08:40
【摘要】：Al和Fe是地殼中儲(chǔ)量最為豐富的2種金屬元素,其合金具有質(zhì)量輕、組織結(jié)構(gòu)穩(wěn)定性高、原料豐富和價(jià)格低等許多優(yōu)良的性能,可以作為輕質(zhì)高強(qiáng)結(jié)構(gòu)件,大大降低重量和成本,在汽車(chē)、航空航天、海洋、國(guó)防和軍工等領(lǐng)域具有廣闊的應(yīng)用前景。本文采用機(jī)械合金化-放電等離子燒結(jié)(Mechanical Alloying-Spark Plasma Sintering,MA-SPS)工藝原位制備了接近理論密度的納米晶Al-Fe復(fù)合材料,利用X射線衍射(X-Ray Diffraction,XRD)、掃描電子顯微鏡(Scanning Electron Microscope,SEM)、透射電子顯微鏡(Transmission Electron Microscope,TEM)和能譜儀(Energy Dispersive Spectrometer,EDS)等分析測(cè)試技術(shù)對(duì)粉末及燒結(jié)試樣的物相組成、組織結(jié)構(gòu)和成分分布進(jìn)行了表征,并檢測(cè)了燒結(jié)試樣的顯微硬度、壓縮性能和拉伸性能等相關(guān)力學(xué)性能,系統(tǒng)研究了MA關(guān)鍵工藝參數(shù)-磨球級(jí)配和Fe含量對(duì)材料組織結(jié)構(gòu)及性能的影響。主要研究成果如下:采用MA-SPS技術(shù)原位制備了接近理論密度的Al13Fe4/Al復(fù)合材料,增強(qiáng)相金屬間化合物Al13Fe4以三種形態(tài)存在于α-Al基體中:大顆粒(1~2μm)、交錯(cuò)分布的短棒狀超細(xì)顆粒(0.1~1.0μm)和納米顆粒(~20nm)。其中,前兩種形態(tài)Al13Fe4相原位生成,后一種納米顆粒Al13Fe4相固溶析出生成。采用磨球級(jí)配對(duì)材料的微觀組織和性能進(jìn)行了優(yōu)化。磨球級(jí)配處理的燒結(jié)試樣塑性得到顯著提高,最大塑性變形量高達(dá)13.6%,這主要?dú)w功于其組織中存在大量的大顆粒α-Al相和超細(xì)顆粒Al13Fe4相。Al-2Fe、A-10Fe、Al-12.5Fe(原子百分含量)三組粉末經(jīng)過(guò)80h機(jī)械合金化后,Al-10Fe的粉末粒徑最小(~10μm);SPS燒結(jié)后,制備的Al-10Fe試樣具有最優(yōu)的綜合壓縮力學(xué)性能:顯微硬度為227HV(1.2GPa),抗壓強(qiáng)度極限為845.8MPa,最大塑性變形量為13.6%。
[Abstract]:Al and Fe are the two most abundant metal elements in the crust. Their alloys have many excellent properties, such as light weight, high structural stability, rich raw materials and low price, which can be used as lightweight and high strength structural parts. Greatly reduce the weight and cost, in the automotive, aerospace, marine, national defense and military industry and other fields have a wide range of applications. Nanocrystalline Al-Fe composites close to theoretical density were in situ prepared by mechanical alloying-spark plasma sintering (Mechanical Alloying-Spark Plasma Sintering,MA-SPS) process. X-ray diffraction (X-Ray Diffraction,XRD) was used to fabricate nanocrystalline Al-Fe composites. Scanning electron microscope (Scanning Electron Microscope,SEM), transmission electron microscope (Transmission Electron Microscope,TEM) and energy dispersive spectroscopy (Energy Dispersive Spectrometer,EDS) were used to characterize the phase composition, microstructure and composition distribution of powder and sintered samples. The mechanical properties such as microhardness, compressive properties and tensile properties of sintered samples were tested. The effects of grinding ball gradation and Fe content on the microstructure and properties of MA were systematically studied. The main results are as follows: in-situ Al13Fe4/Al composites with close theoretical density were prepared by MA-SPS technique. The reinforced intermetallic compound Al13Fe4 exists in 偽-Al matrix in three forms: large particles (1 ~ 2 渭 m), Interlaced short rod-like ultrafine particles (0.1 ~ 1.0 渭 m) and nano-particles (~ 20nm). The first two forms of Al13Fe4 phase were formed in situ, and the latter one was formed by solid solution precipitation of nanoparticles Al13Fe4 phase. The microstructure and properties of grinding ball pairing materials were optimized. The plasticity of sintered samples treated with grinding ball gradation was improved significantly, and the maximum plastic deformation was up to 13.6%. This is mainly due to the large amount of 偽-Al phase and ultra-fine Al13Fe4 phase in the microstructure. Al-2Fe,A-10Fe, After 80 h mechanical alloying of Al-12.5Fe powder, the particle size of Al-10Fe powder was the smallest (~ 10 渭 m). After sintering with SPS, the prepared Al-10Fe samples have the best comprehensive compressive mechanical properties: the microhardness is 227HV (1.2GPa), the compressive strength limit is 845.8 MPA, and the maximum plastic deformation is 13.6%.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB331
[Abstract]:Al and Fe are the two most abundant metal elements in the crust. Their alloys have many excellent properties, such as light weight, high structural stability, rich raw materials and low price, which can be used as lightweight and high strength structural parts. Greatly reduce the weight and cost, in the automotive, aerospace, marine, national defense and military industry and other fields have a wide range of applications. Nanocrystalline Al-Fe composites close to theoretical density were in situ prepared by mechanical alloying-spark plasma sintering (Mechanical Alloying-Spark Plasma Sintering,MA-SPS) process. X-ray diffraction (X-Ray Diffraction,XRD) was used to fabricate nanocrystalline Al-Fe composites. Scanning electron microscope (Scanning Electron Microscope,SEM), transmission electron microscope (Transmission Electron Microscope,TEM) and energy dispersive spectroscopy (Energy Dispersive Spectrometer,EDS) were used to characterize the phase composition, microstructure and composition distribution of powder and sintered samples. The mechanical properties such as microhardness, compressive properties and tensile properties of sintered samples were tested. The effects of grinding ball gradation and Fe content on the microstructure and properties of MA were systematically studied. The main results are as follows: in-situ Al13Fe4/Al composites with close theoretical density were prepared by MA-SPS technique. The reinforced intermetallic compound Al13Fe4 exists in 偽-Al matrix in three forms: large particles (1 ~ 2 渭 m), Interlaced short rod-like ultrafine particles (0.1 ~ 1.0 渭 m) and nano-particles (~ 20nm). The first two forms of Al13Fe4 phase were formed in situ, and the latter one was formed by solid solution precipitation of nanoparticles Al13Fe4 phase. The microstructure and properties of grinding ball pairing materials were optimized. The plasticity of sintered samples treated with grinding ball gradation was improved significantly, and the maximum plastic deformation was up to 13.6%. This is mainly due to the large amount of 偽-Al phase and ultra-fine Al13Fe4 phase in the microstructure. Al-2Fe,A-10Fe, After 80 h mechanical alloying of Al-12.5Fe powder, the particle size of Al-10Fe powder was the smallest (~ 10 渭 m). After sintering with SPS, the prepared Al-10Fe samples have the best comprehensive compressive mechanical properties: the microhardness is 227HV (1.2GPa), the compressive strength limit is 845.8 MPA, and the maximum plastic deformation is 13.6%.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB331
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