本文關鍵詞：CuZr基塊體非晶復合材料的制備及其組織結構與性能的研究　出處：《南昌大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： CuZr基非晶合金 B2-CuZr相 非晶形成能力 組織結構 力學性能

【摘要】：CuZr系塊體非晶合金以其較低的成本、優(yōu)良的非晶形成能力和力學性能受到國內(nèi)外研究者們的廣泛關注。且研究表明,在該合金系中如果存在B2-CuZr結晶相,合金的塑性將大大提高,并表現(xiàn)出明顯“加工硬化”現(xiàn)象。因此,通過合理的微合金化,進一步提高CuZr合金系的非晶形成能力(GFA),形成大尺寸塊體非晶合金,從而制備大塊強韌非晶合金基復合材料,已成為非晶材料領域的研究熱點。本文選取Cu47Zr47Al6合金系,通過加入微量元素Y,探究Y的添加對合金非晶形成能力、組織結構以及力學性能的影響;并選取實驗條件下?lián)碛凶詈梅蔷纬赡芰Φ暮辖鹣?分別通過冷軋及添加不同含量Nb和Ta,促進B2-CuZr增強相的生成,以期制備出具有優(yōu)良綜合力學性能的塊體非晶基復合材料。選用純度相對較低的原材料,利用真空銅模噴鑄技術制備出名義成分為(Cu0.47Zr0.47Al0.06)100-xYx(x=0,2,4,6 at.%),φ=2 mm的棒狀合金試樣。通過X射線衍射儀、差示掃描量熱儀、全自動壓力試驗機、金相顯微鏡、顯微維氏硬度儀,分析Y的添加對合金非晶形成能力及力學性能的影響。結果表明:在一定量范圍內(nèi),加入Y能明顯提高Cu47Zr47Al6合金系的非晶形成能力,抑制B2-CuZr相的共析分解。在本實驗范圍內(nèi),Y加入量為4 at.%的試樣玻璃形成能力(GFA)最好,抗壓強度達到最大值1859 MPa。選取具有最好非晶形成能力的(Cu0.47Zr0.47Al0.06)96Y4成分,真空噴鑄制備1.5mm×5 mm的板條狀試樣,通過冷軋促進結晶,探究形變對合金組織結構和力學性能的影響。結果表明:形變率為6.67%的預冷軋沒有改變試樣的結晶相組成,在鑄態(tài)和軋后試樣中,結晶相均為B2-CuZr、Cu10Zr7、CuZr2以及少量氧化物雜質相。但冷軋明顯增加了試樣中結晶相的含量。結晶相和殘余應力的綜合作用,使軋后試樣硬度提高。在(Cu0.47Zr0.47Al0.06)96Y4合金的基礎上分別添加不同含量的Nb、Ta元素,制備出名義成分為(Cu0.45Zr0.45Al0.06Y0.04)100-xNbx(x=0,1,2,3 at.%)、(Cu0.45Zr0.45Al0.06Y0.04)100-xTax(x=0,1,2,3 at.%),φ=2 mm的棒狀合金試樣,探討Nb、Ta的加入對非晶合金組織及性能的影響。結果表明:Nb的添加降低了合金系的非晶形成能力,且Nb作為異質形核劑促進了B2-CuZr相的析出,改善了試樣的力學性能。在本實驗范圍內(nèi),當Nb添加量為1 at.%時,試樣內(nèi)B2-CuZr相含量較多,表現(xiàn)為較好的室溫塑性,塑性形變約為0.3%(±0.05%);一定量Ta的添加,可以降低(Cu0.47Zr0.47Al0.06)96Y4合金的非晶形成能力(GFA),促進單一B2-CuZr增強相的析出。在本實驗范圍內(nèi),Ta添加量為2 at.%時,在(Cu0.47Zr0.47Al0.06)96Y4塊體非晶基體上可獲得最高體積分數(shù)的B2-CuZr強韌相,表現(xiàn)出約為3%的最大塑性形變。
[Abstract]:CuZr bulk amorphous alloys have attracted much attention from researchers at home and abroad for their low cost, excellent amorphous forming ability and mechanical properties. If there is B2-CuZr crystalline phase in the alloy system, the plasticity of the alloy will be greatly improved, and the phenomenon of "work hardening" will be obvious. Therefore, reasonable microalloying is adopted. The amorphous forming ability of CuZr alloy system was further improved and large bulk amorphous alloy was formed, which resulted in the preparation of large bulk amorphous alloy matrix composites. In this paper, the Cu47Zr47Al6 alloy system is selected, and the addition of Y to the amorphous forming ability of the alloy is explored by adding the trace element Y. The influence of structure and mechanical properties; By cold rolling and adding different contents of NB and Ta, the formation of B2-CuZr reinforced phase was promoted by selecting the alloy system with the best amorphous forming ability under the experimental conditions. In order to prepare bulk amorphous matrix composites with excellent comprehensive mechanical properties, the raw materials with relatively low purity were selected. The nominal composition is Cu0.47Zr0.47Al0.06n 100-xYxOXYXYXYXYXYXUX 0OXYXYXUX OXYXYXYXUX (0) and 6T / 6AT.TECHANE). The specimens of 2mm rod alloy were tested by X-ray diffractometer, differential scanning calorimeter, automatic pressure tester, metallographic microscope and Vickers hardness tester. The effect of Y addition on the amorphous forming ability and mechanical properties of Cu47Zr47Al6 alloy was analyzed. The results showed that the addition of Y could obviously improve the amorphous forming ability of Cu47Zr47Al6 alloy system in a certain range. In the range of this experiment, the glass forming ability of the sample containing 4 at.% of Y is the best, which can inhibit the eutectoid decomposition of B2-CuZr phase. The compressive strength reached the maximum value of 1859 MPA. The composition of Cu0.47Zr0.47Al0.06 / 96Y4 with the best amorphous forming ability was selected. The strip specimen of 1.5mm 脳 5mm was prepared by vacuum spray casting, and the crystallization was promoted by cold rolling. The effect of deformation on the microstructure and mechanical properties of the alloy was investigated. The results showed that the pre-cold rolling with deformation rate of 6.67% did not change the crystalline phase composition of the sample, and it was found in the as-cast and post-rolled specimens. The crystalline phase is B2-CuZr-Cu10Zr7CuZr2 and a small amount of oxide impurity phase, but cold rolling obviously increases the content of crystalline phase and the comprehensive effect of crystalline phase and residual stress. The hardness of the samples was increased after rolling. Different contents of NB Ta were added on the basis of Cu0.47Zr0.47Al0.06Al-96Y4 alloy. The nominal composition is Cu0.45Zr0.45Al0.06Y0.04U 100-xNbxxnbxnxnxcnxcnbxxcnxxc0OOONBXXOXOXOXOXOXOXOXOXOX@@. Cu0.45Zr0.45Al0.06Y0.04n 100-xTaxxOOOXOXYOXYOXOXYOXYOXYOXYOXYLICOZHUS, 1, 1, 2, 2, 2, 2 mm Rod shape alloy samples, NB was studied in this paper. The effect of Ta addition on the microstructure and properties of amorphous alloys. The results show that the addition of 1% NB reduces the amorphous forming ability of the alloy system, and NB acts as a heterogeneous nucleating agent to promote the precipitation of B2-CuZr phase. The mechanical properties of the samples were improved. In the range of this experiment, the content of B2-CuZr phase was higher when NB content was 1 at.%, which showed good room temperature plasticity. The plastic deformation is about 0.3 (鹵0.05). The amorphous forming ability of Cu0.47Zr0.47Al0.06Al-96Y4 alloy can be reduced by adding a certain amount of Ta. The precipitation of single B2-CuZr enhanced phase was promoted. In this experimental range, the addition of Ta was 2 at.%. The maximum volume fraction of B2-CuZr is obtained on Cu0.47Zr0.47Al0.06 / 96Y4 bulk amorphous matrix, showing the maximum plastic deformation of about 3%.
【學位授予單位】：南昌大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB33

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本文編號：1402494