發(fā)布時(shí)間：2018-03-24 18:13

  本文選題：高熵合金　切入點(diǎn)：FeCoCrNiAl涂層　出處：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文

【摘要】：高熵合金是近年來(lái)才被提出的一種新的合金設(shè)計(jì)理念。它的原理是在合金系統(tǒng)當(dāng)中加入5種或者5種以上的合金元素,通過(guò)將每種合金元素含量控制在5%至35%之間,實(shí)現(xiàn)提高合金系統(tǒng)熵值的目的。高熵合金以其優(yōu)異的力學(xué)性能在涂層制備方面具有廣闊的應(yīng)用空間。但是高熵合金體系過(guò)于龐大、涉及面廣、發(fā)現(xiàn)時(shí)間短,因此涂層制備工藝以及元素含量對(duì)于其合金系統(tǒng)作用機(jī)理及實(shí)驗(yàn)數(shù)據(jù)尚不完善,急需進(jìn)一步的研究�；诖吮疚睦脪呙桦婄R(SEM)、能譜儀(EDS)、X射線衍射儀(XRD)、維氏硬度計(jì)、多功能試驗(yàn)機(jī)等多種手段研究了B、Ti、Nb含量對(duì)于Fe CoCrNiAl高熵合金涂層組織結(jié)構(gòu)的影響,并對(duì)比了直接激光熔覆與等離子噴涂預(yù)制后激光重熔兩種工藝對(duì)涂層的影響結(jié)果,系統(tǒng)的研究了高熵合金組織的形成機(jī)理及相演變過(guò)程,測(cè)試了涂層力學(xué)性能并分析了影響因素。研究結(jié)果表明:直接進(jìn)行激光熔覆與先使用等離子噴涂預(yù)制涂層之后激光重熔后涂層相比,激光重熔對(duì)于基體熱輸入較低,熔池較淺,但兩種涂層的相組成與力學(xué)性能相差并不大。B、Ti、Nb元素都對(duì)Fe CoCrNiAl高熵合金涂層組織結(jié)構(gòu)起到明顯的晶粒細(xì)化作用。B含量升高的過(guò)程中,FCC相減少而B(niǎo)CC相增多;Ti加入后FCC相消失,產(chǎn)生BCC2相;而加入Nb后產(chǎn)生FCC2相。經(jīng)過(guò)維氏硬度檢測(cè),FeCo Cr NiAlB0.75、Fe Co Cr NiAlTi、FeCo CrNiAlNb0.5涂層硬度為各合金系最大,分別為726Hv、966Hv、773Hv。各涂層在硬度達(dá)到最大的同時(shí),耐磨性能也隨之達(dá)到最大。經(jīng)研究發(fā)現(xiàn),B與Ti都為BCC相形成元素,而Nb為FCC相形成元素。B與Ti對(duì)于Fe CoCrNiAl系高熵合金涂層組織及性能的作用機(jī)理相類似,力學(xué)性能隨元素含量增大而提高。而Nb元素添加后在合金組成為Fe Co CrNiAlNb0.5時(shí)達(dá)到硬度最大值,隨Nb含量繼續(xù)添加出現(xiàn)下降趨勢(shì)。
[Abstract]:High entropy alloy is a new concept of alloy design that was developed recently. Its principle is to add 5 or more than 5 kinds of alloy elements in the alloy system, through each kind of alloy element content is controlled in the range of 5% to 35%, improve the alloy system entropy has a broad application space. High entropy alloy with excellent mechanical properties in coating preparation. But high entropy alloy system is too large, involving a wide range, that time is short, so the coating preparation process and content for the alloy system mechanism and the experimental data is not perfect, the urgent need for more research. This paper based on SEM (SEM), energy dispersive spectroscopy (EDS), X ray diffraction (XRD), Vivtorinox hardness, multi-function testing machine and other means of B, Ti, Nb content on coating microstructure of Fe high entropy alloy CoCrNiAl influence, and compared directly The effect of laser cladding and prefabricated after plasma spraying laser remelting process of two kinds of coatings, systematic study on the formation mechanism of microstructure of high entropy alloy and phase transformation process, testing the mechanical properties of the coating are analyzed. The results show that: directly after laser cladding and plasma spraying coating using prefabricated laser after laser remelting remelting coatings compared to the substrate heat input is low, the molten pool is shallow, but the two kinds of coating phase composition and mechanical properties of a little.B, Ti, Nb elements on coating microstructure of Fe high entropy alloy CoCrNiAl to grain refinement effect of.B was significantly increased in FCC phase decreased and BCC phase increased; the addition of Ti FCC phase BCC2 phase; disappeared, and after joining the Nb FCC2 phase. After Vivtorinox FeCo Cr hardness testing, NiAlB0.75, Fe Co Cr NiAlTi FeCo CrNiAlNb0.5, the hardness of coating Gold is the largest, respectively 726Hv, 966Hv, 773Hv. coating reached the maximum while the hardness, wear resistance also will reach the maximum. The study found that B and Ti are BCC phase forming elements, and Nb is the FCC phase formation mechanism of elements.B and Ti on the microstructure and properties of high entropy alloy coating Fe CoCrNiAl similar mechanical properties with element content increased. While the Nb element was added in the alloy composition of Fe Co CrNiAlNb0.5 reached the maximum hardness, with Nb content to add a declining trend.

【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG174.4

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本文編號(hào)：1659453