本文選題：非晶合金　切入點(diǎn)：過冷液相區(qū)　出處：《沈陽工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：非晶合金具有優(yōu)良的綜合性能,非晶合金在過冷液相區(qū)內(nèi)表現(xiàn)出超塑性,適于非晶合金的成形。本文所選用的(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金具有較大的非晶形成能力,通過銅模鑄造制備了長度為80mm,寬度為12mm,厚度為2mm的(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金板材。采用X射線衍射(XRD)和差示掃描量熱儀(DSC)對所制備的樣品進(jìn)行結(jié)構(gòu)分析和熱差分析。采用在MTS Exceed萬能力學(xué)性能試驗(yàn)機(jī)在(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金過冷液相區(qū)內(nèi),溫度范圍為612K~632K,應(yīng)變速率范圍為1.0×10-3s-1~0.1×10-3s-1,進(jìn)行拉伸實(shí)驗(yàn),并通過掃描電鏡(SEM)進(jìn)行對斷口形貌進(jìn)行觀察。獲得的主要研究結(jié)果如下:通過XRD鑄態(tài)(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9合金結(jié)構(gòu)為非晶態(tài),通過DSC確定了非晶合金的玻璃轉(zhuǎn)變溫度Tg=612K,晶化開始溫度Tx=671K,過冷液相區(qū)?T=Tx-Tg=59K當(dāng)溫度低于617K或者是應(yīng)變速率高于0.75×10-3s-1的時,(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金發(fā)生應(yīng)力過沖現(xiàn)象。而隨著應(yīng)變的增加,由應(yīng)力過沖的非牛頓流動變形轉(zhuǎn)變?yōu)榕ｎD流動變形。當(dāng)溫度高于622K或應(yīng)變速率低于0.5×10-3s-1時,(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金表現(xiàn)為不發(fā)生應(yīng)力過沖的牛頓流變形式。在牛頓流變過程中,斷口呈現(xiàn)出大量放射狀脈絡(luò)花紋和少量的熔融狀液滴。隨著應(yīng)變速率的升高和溫度的降低,(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金的斷口由放射狀脈絡(luò)花紋逐漸轉(zhuǎn)變?yōu)橛痦?xiàng)型花紋或者是葉脈狀花紋,此非晶合金由韌性斷裂轉(zhuǎn)變?yōu)榇嘈詳嗔�。采用擴(kuò)展指數(shù)模型、自由體積模型、Maxwell-Pulse模型對(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金在拉伸實(shí)驗(yàn)條件下進(jìn)行擬合:自由體積方程能夠表征(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金在拉伸實(shí)驗(yàn)條件下的應(yīng)力過沖現(xiàn)象和穩(wěn)態(tài)流動變形,對某一特定區(qū)域擬合曲線與實(shí)驗(yàn)數(shù)據(jù)存在差異較大;擴(kuò)展指數(shù)方程能夠表征(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金在拉伸實(shí)驗(yàn)條件下的穩(wěn)態(tài)流動變形,不能擬合出最大應(yīng)力過沖值,使用范圍局限;Maxwell-Pulse本構(gòu)方程能夠很好的表征(Zr33.2Ti36.1Ni5.8Be24.9)91Cu9非晶合金在拉伸實(shí)驗(yàn)條件下的穩(wěn)態(tài)流動變形和應(yīng)力過沖現(xiàn)象。
[Abstract]:The amorphous alloy has excellent comprehensive properties, and the amorphous alloy exhibits superplasticity in the supercooled liquid region, which is suitable for the forming of the amorphous alloy. The amorphous alloy selected in this paper has a large amorphous forming ability, which is composed of 33.2 Ti36.1Ni5.8Be24.9Ni5.8Be24.9Cu9 amorphous alloys. Amorphous Zr33.2Ti36.1Ni5.8Be24.9Cu9 alloy plates with length of 80mm, width of 12mm and thickness of 2mm were prepared by copper mold casting. The structure and thermal difference of the samples were analyzed by X-ray diffraction (XRD) and differential scanning calorimeter (DSC). Exceed universal mechanical property tester was used in the supercooled liquid phase region of Zr33.2Ti36.1Ni5.8Be24.9B91Cu9 amorphous alloy. The tensile test was carried out and the fracture morphology was observed by SEM (scanning electron microscope). The main results obtained were as follows: the amorphous structure of Zr33.2Ti36.1Ni5.8Be24.91Cu9 alloy was obtained by the XRD cast state of Zr33.2Ti36.1Ni5.8Be24.91Cu9 alloy. The glass transition temperature (TG) of amorphous alloy was determined by DSC, the crystallization start temperature was T _ (x) 671 K, and the supercooled liquid phase region was obtained. When the temperature is below 617K or the strain rate is higher than 0.75 脳 10 ~ (-3) s ~ (-1), the stress overshoot occurs in the amorphous alloy Zr33.2Ti36.1Ni5.8Be24.9 / 91Cu9. When the temperature is higher than 622K or the strain rate is lower than 0.5 脳 10 ~ (-3) s ~ (-1), the Zr33.2Ti36.1Ni5.8Be24.9Cu _ 9 amorphous alloy exhibits a Newtonian rheology without stress overshoot. With the increase of strain rate and the decrease of temperature, the fracture surface of Zr33.2Ti36.1Ni5.8Be24.9 91Cu9 amorphous alloy gradually changed from radial choroid pattern to plume pattern or leaf vein pattern. The amorphous alloy changed from ductile fracture to brittle fracture. The free volume model and Maxwell-Pulse model were used to simulate the tensile test of Zr33.2Ti36.1Ni5.8Be24.9N 91Cu9 amorphous alloy. The free volume equation can characterize the stress overshoot and steady flow deformation of Zr33.2Ti36.1Ni5.8Be24.924.91Cu9 amorphous alloy. There is a great difference between the fitting curve and the experimental data for a particular region, and the extended exponential equation can characterize the steady flow deformation of Zr33.2Ti36.1Ni5.8Be24.9CU _ 9 amorphous alloy under tensile test conditions, and can not fit the maximum stress overshoot value. The Maxwell-Pulse constitutive equation can be used to characterize the steady flow deformation and stress overshoot of Zr33.2Ti36.1Ni5.8Be24.9Cu9 amorphous alloy under tensile test conditions.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG139.8

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