本文選題：Ti基非晶合金　切入點(diǎn)：相組成　出處：《大連交通大學(xué)》2015年碩士論文

【摘要】：本論文主要是在具有較大玻璃形成能力的Ti Ni Cu合金體系中添加Nb、Zr和Sn元素。采用銅模噴鑄法和甩帶法制備出了Ti Ni Cu Nb、Ti Ni Cu Zr非晶復(fù)合材料,利用電弧熔煉制得Ti Ni Cu Zr Sn合金,利用XRD、DSC和電阻法等方法對(duì)合金的相組成和馬氏體相變溫度等分析測(cè)試,討論了不同的合金元素、冷卻速度和熱處理溫度對(duì)合金組織結(jié)構(gòu)與相變溫度的影響。含量為4at.%Nb元素及4at.%和5at.%Zr元素能夠促進(jìn)Ti Ni Cu Nb/Zr合金發(fā)生馬氏體相變,合金中主要有B2相和B19相,在升溫和降溫過程中發(fā)生一階B2 B19相變。Nb能促進(jìn)合金析出枝晶相β-Nb相,顯著降低Ms點(diǎn),增大相變熱滯后ΔT;隨著Zr含量的增加,Ti Ni Cu Zr合金的Ms點(diǎn)先降低后升高,熱滯后ΔT先增大后減小。Ti50Ni25Cu25非晶合金板條發(fā)生一階B2 B19相變,Ti45Ni25Cu25Zr5非晶合金板條發(fā)生B2 R B19'二階相變。噴鑄后合金馬氏體相變點(diǎn)都顯著降低,相變滯后增加。經(jīng)過300℃和500℃時(shí)效后相變點(diǎn)和相變滯后變化不大,合金具有較穩(wěn)定的馬氏體相變過程。甩帶法和噴鑄法都能夠制得Ti基非晶復(fù)合材料。Nb元素降低合金非晶形成能力,4at.%和5at.%的Zr元素能夠提高非晶形成能力。經(jīng)過時(shí)效處理后,Ti基非晶合金發(fā)生一定的晶化行為,析出晶體相。Ti Zr Cu Ni Sn五種合金主要晶體相為B2相、tP4 TiCu相和(Ni,Ti)相,Sn元素促進(jìn)枝晶相tP4 TiCu相的產(chǎn)生。Sn元素含量為3.1at.%的三種合金只在升溫過程中發(fā)生B19 B2逆相變,合金具有穩(wěn)定的馬氏體相變過程,Cu元素逐步代替Ni元素時(shí),逆相變溫度As升高。Sn元素含量為3at.%的Ti50Ni25Cu16Zr6Sn3合金發(fā)生B2 R B19'二階相變,Ti50Ni16Cu25Zr6Sn3合金發(fā)生B2 B19相變。Cu元素代替Ni元素含量為9at.%時(shí),Ms點(diǎn)和Mf點(diǎn)下降,合金的相變滯后有很小的減小。
[Abstract]:In this paper, NB, Zr and Sn elements were added to Ti / Ni / Ni / Cu alloy system with high glass-forming ability. Amorphous composites were prepared by copper mold spray casting method and strip throwing method. The phase composition and martensite transformation temperature of the alloy were analyzed and measured by means of XRDX DSC and resistance method, and different alloy elements were discussed, and the alloy was prepared by electric arc melting, and the alloy was prepared by arc melting, and the phase composition and martensite transformation temperature of the alloy were measured by means of XRDX DSC and resistance method. The effects of cooling rate and heat treatment temperature on the microstructure and transformation temperature of the alloy were studied. The contents of 4at.%Nb, 4at.% and 5at.%Zr can promote martensitic transformation in Ti Ni Ni Cu Cu Nb/Zr alloy, and the main phases in the alloy are B2 phase and B19 phase. In the process of heating and cooling, the first order B 2 + B 19 phase transformation. NB can promote the precipitation of dendritic phase 尾 -Nb phase, decrease the Ms point and increase the phase transformation thermal hysteresis 螖 T, with the increase of Zr content, the Ms point of the alloy decreases first and then increases. The thermal hysteresis 螖 T increases first, then decreases. Ti50Ni25Cu25 amorphous alloy lath takes place the first order B 2 + B 19 phase transformation of Ti45Ni25Cu25Zr5 amorphous alloy strip. The B 2 / R B ~ (19') second order phase transformation occurs. The martensite transformation point of the alloy decreases significantly after spray casting. Phase transition hysteresis increases. After aging at 300 鈩，

本文編號(hào)：1694170