本文選題：超多元Zr基塊體非晶合金　切入點(diǎn)：雜質(zhì)　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：Zr基塊體非晶合金擁有較傳統(tǒng)晶態(tài)合金材料更高的彈性、強(qiáng)度、硬度、耐蝕性等優(yōu)良的性能,是一種極具潛力的結(jié)構(gòu)材料。但Zr基塊體非晶合金的生產(chǎn)對雜質(zhì)極其敏感,必須使用高純原料和苛刻的生產(chǎn)條件才能制備,因而導(dǎo)致Zr基塊體非晶合金的廣泛應(yīng)用受到了極大的限制。最近的研究顯示,超多元Zr基塊體非晶合金可以有效地降低雜質(zhì)對其形成能力和性能的影響,具有很高的應(yīng)用潛力,但雜質(zhì)對其形成能力及性能的影響機(jī)制尚不清楚。本文以超多元Zr50Cu25Al10Ni7Ti4Co2Fe1Y1塊體非晶合金為研究對象,通過添加不同質(zhì)量分?jǐn)?shù)的低純Zr原料(海綿Zr),詳細(xì)地研究了雜質(zhì)對超多元Zr基塊體非晶合金形成能力、熱穩(wěn)定性、力學(xué)性能和耐蝕性的影響。首先,本文研究了雜質(zhì)對超多元Zr基塊體非晶合金形成能力的影響。以過冷液相區(qū)寬度△Tx為判據(jù),通過對不同雜質(zhì)含量的超多元Zr基塊體非晶合金試樣進(jìn)行DSC分析,發(fā)現(xiàn)它們的△Tx非常接近,雜質(zhì)含量對超多元Zr基塊體非晶合金的形成能力影響不大。其電弧熔煉后的直徑為20 mm的鑄錠在剪開后也呈現(xiàn)典型的玻璃狀斷口,且XRD結(jié)果顯示其晶化程度較低,表現(xiàn)出其良好的非晶形成能力。其次,本文對不同含量海綿Zr制備的超多元Zr基塊體非晶合金的熱穩(wěn)定性及晶化行為進(jìn)行了進(jìn)一步的系統(tǒng)研究。通過DSC曲線分析發(fā)現(xiàn)雜質(zhì)對該合金的熱穩(wěn)定性影響不大,但會影響超多元Zr基塊體非晶合金的晶化行為,并且隨雜質(zhì)含量的升高,其晶化過程更加復(fù)雜,晶化時(shí)間更長。對不同雜質(zhì)含量的塊體非晶合金的完全晶化產(chǎn)物進(jìn)行分析發(fā)現(xiàn),雜質(zhì)含量不會影響該非晶合金的晶化產(chǎn)物,析出相主要具有CuZr2、Cu10Zr7和多種ZrAl相結(jié)構(gòu)。最后,本文又分析了不同含量海綿Zr制備的超多元Zr基塊體非晶合金的力學(xué)和化學(xué)性能。通過室溫準(zhǔn)靜態(tài)壓縮試驗(yàn)可知,含雜質(zhì)的超多元Zr基塊體非晶合金的強(qiáng)度、硬度都很高,變化不大,但雜質(zhì)含量的不同對該合金的塑性有著不同的影響,低濃度雜質(zhì)含量不會使合金基體脆化,對塑性影響不大,而當(dāng)海綿Zr的質(zhì)量分?jǐn)?shù)達(dá)到80%以上時(shí),塑性可達(dá)6.7%,是高純原料制備時(shí)的3倍。雜質(zhì)誘發(fā)基體原位析出5 nm左右的納米相,導(dǎo)致塊體非晶合金的塑性極大地提升。此外,高純原料制備的超多元Zr基塊體非晶合金在經(jīng)過低溫弛豫后塑性大幅升高,而高雜質(zhì)含量的超多元Zr基塊體非晶合金在經(jīng)過低溫弛豫后塑性有所下降。這可能是因?yàn)楦呒冊现苽涞某嘣猌r基塊體非晶合金在低溫弛豫時(shí)導(dǎo)致了成分不均勻性的提升,而高雜質(zhì)含量的超多元Zr基塊體非晶合金中納米晶的作用會隨著自由體積的減少而減弱。電化學(xué)腐蝕實(shí)驗(yàn)顯示雜質(zhì)的存在不會顯著地影響超多元Zr基塊體非晶合金的自腐蝕電位,意味著雜質(zhì)對超多元Zr基塊體非晶合金的耐蝕性沒有明顯影響。
[Abstract]:Zr based bulk amorphous alloy has a traditional amorphous alloy materials of high elasticity, strength, hardness, corrosion resistance and other excellent properties, is a kind of potential structural material. But the Zr based bulk amorphous alloy production is extremely sensitive to impurities, must use high pure raw materials and strict production conditions the preparation, which lead to the extensive application of Zr based bulk amorphous alloy has been greatly restricted. Recent studies have shown that the super multi Zr based bulk amorphous alloys can effectively reduce the influence of impurity forming ability and on its performance, has very high application potential, but the mechanism of the effect of impurity forming ability and performance for it is not clear. In this paper, super multi Zr50Cu25Al10Ni7Ti4Co2Fe1Y1 bulk amorphous alloy as the research object, by adding different mass fractions of low purity Zr raw materials (sponge Zr), a detailed study of the impurities on the super multi Zr based bulk amorphous alloy Forming ability, thermal stability, mechanical properties and corrosion resistance were studied in this paper. Firstly, impurities on the super multiple Zr based bulk amorphous alloy forming ability of non impact. In the supercooled liquid region width Delta Tx criterion based on different impurity content over multiple Zr based bulk amorphous alloy samples DSC analysis found that they are very close to the Tx, impurity content in super multi impact forming ability of Zr based bulk amorphous alloy. The arc melting after the diameter of 20 mm ingot also showed glassy fracture is typical in the cut, and XRD results showed that the crystallization degree is low, showing the good glass forming ability. Secondly, the different content of Zr sponge preparation of super multi Zr based bulk amorphous alloy thermal stability and crystallization behavior were studied further. Through the DSC curve analysis showed that thermal stability of impurities on the alloy The impact is not big, but will affect the super multi Zr based bulk amorphous alloy crystallization behavior, and with the increase of impurity content, the crystallization process is more complex, longer crystallization time. Complete crystallization products block of different impurity content of the amorphous alloy was found that impurity content does not affect the crystallization of the amorphous alloy the precipitates are mainly CuZr2, Cu10Zr7 and ZrAl phase structure. Finally, this paper analyzes the different content of Zr sponge preparation of super multi Zr based bulk amorphous alloy by mechanical and chemical properties of room temperature. Through the quasi-static compression test can know, super multi Zr based bulk amorphous alloy strength the content of impurity, the hardness is very high, with little change, but has different effects on different plastic impurity content of the alloy, low concentration impurity content does not make the alloy brittle, the plastic is not affected, but when the mass fraction of Zr sponge More than 80% plastic, up to 6.7%, is 3 times higher than pure material when preparing nano matrix. The impurity induced in-situ precipitation around 5 nm phase, leading to the plasticity of bulk amorphous alloys are greatly improved. In addition, high purity raw material preparation of super multi Zr based bulk amorphous alloy in after low temperature relaxation after plasticsignificantly increased, while the high impurity content super multi Zr based bulk amorphous alloy after low temperature relaxation after plastic decline. This may be because of high purity raw materials for the preparation of super multi Zr based bulk amorphous alloy in low temperature relaxation leads to the improvement of the no uniform composition, and super multiple Zr based bulk amorphous alloy in non nanocrystalline high impurity content decreases with the decrease in free volume. The electrochemical corrosion experiment shows that there is no significant influence over multiple corrosion potentials of Zr based bulk amorphous alloy impurities, means of impurities on the super multi Zr The corrosion resistance of the base bulk amorphous alloy has no obvious effect.

【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG139.8

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