本文選題：AlMgSiCu合金 + 軋制工藝　； 參考：《廣西科技大學(xué)》2017年碩士論文

【摘要】：AlMgSiCu合金具有中等強(qiáng)度、密度低、良好的耐腐蝕性、焊接性、成形性等優(yōu)點(diǎn)。在航空、汽車、軌道運(yùn)輸、建筑等領(lǐng)域得到了廣泛的應(yīng)用。為改善合金力學(xué)性能,使得其得到了增強(qiáng),同時(shí)在減振降噪技術(shù)中選擇經(jīng)濟(jì)、有效和方便的途徑,從而提高產(chǎn)品的安全性和壽命。針對(duì)這需求,本論文在AlMgSiCu合金基礎(chǔ)上,結(jié)合實(shí)際生產(chǎn)及檢驗(yàn)條件,通過分析不同熱處理工藝、軋制工藝、合金元素等對(duì)板材力學(xué)性能及阻尼特性的影響,探索合金顯微組織、力學(xué)性能及阻尼特性的影響規(guī)律,從而優(yōu)化工藝參數(shù),為實(shí)際生產(chǎn)提供指導(dǎo)意義。本次研究得到的結(jié)論及規(guī)律如下:(1)采用均勻化處理消除鑄態(tài)枝晶偏析。合金經(jīng)560℃×24h均勻化處理,組織中非平衡相基本溶解,晶粒得到明顯細(xì)化,硬度值達(dá)到最高,抗拉強(qiáng)度為204 MPa,屈服強(qiáng)度為187 MPa,伸長率達(dá)8.5%。(2)對(duì)AlMgSiCu合金進(jìn)行大應(yīng)變軋制試驗(yàn),據(jù)研究,影響軋制工藝的有軋制速率,道次變形量及軋制溫度等,通過對(duì)以上三種因素進(jìn)一步探索,得出AlMgSiCu合金在經(jīng)過400℃、10s-1應(yīng)變速率熱軋和固溶時(shí)效后,合金性能明顯提高,此時(shí)的硬度值到達(dá)103.3HV,抗拉強(qiáng)度到達(dá)350MPa,伸長率到達(dá)35.5%。(3)合理優(yōu)化主要合金元素含量以及適量調(diào)整加入微量元素含量的比例可以有效地提高強(qiáng)化效果,改善AlMgSiCu合金的組織及力學(xué)性能。為提高合金力學(xué)性能,AlMgSiCu合金的抗拉強(qiáng)度隨Zr含量的增加而增加,0.7%Zr時(shí)抗拉強(qiáng)度高達(dá)490MPa;適當(dāng)增加Er、Mn元素質(zhì)量分?jǐn)?shù)的增加,合金力學(xué)性能顯著提高,0.7%Mn時(shí)抗拉強(qiáng)度到達(dá)493MPa;Zr、Mn元素更能顯著的改善AlMgSiCu合金組織及力學(xué)性能。(4)通過模量和阻尼值的確定判斷合金的減聲降噪性能。不同工藝下阻尼值均有差異,尋找規(guī)律,總體來說,軋制態(tài)下,阻尼值更易出現(xiàn)峰值,彈性模量易出現(xiàn)最低值。不同軋制速率變形后合金內(nèi)形成了大量的位錯(cuò),可動(dòng)位錯(cuò)密度相差較大,對(duì)AlMgSiCu合金性能影響差別更明顯。熱處理過后,軋制速率對(duì)AlMgSiCu鋁合金的阻尼特性具有相同的規(guī)律,彈性模量隨著溫度的增加呈線性關(guān)系下降,在室溫和高溫下,頻率對(duì)合金阻尼的作用不同。
[Abstract]:AlMgSiCu alloy has the advantages of medium strength, low density, good corrosion resistance, weldability, formability and so on. It has been widely used in the fields of aviation, automobile, rail transportation, building and so on. In order to improve the mechanical properties of the alloy, it has been enhanced, and the method of selecting economy, effective and convenient in vibration reduction and noise reduction technology is improved. On the basis of this demand, on the basis of AlMgSiCu alloy, the influence of different heat treatment process, rolling process and alloy element on the mechanical properties and damping characteristics of plate is analyzed on the basis of the actual production and inspection conditions, and the influence rules of the alloy microfabric, mechanical properties and damping characteristics are explored. The conclusions and rules obtained in this study are as follows: (1) using homogenization treatment to eliminate the cast dendrite segregation. After the homogenization of the alloy at 560 C 24h, the nonequilibrium phase in the microstructure is basically dissolved, the grain is refined, the hardness is the highest, the tensile strength is 204 MPa, and the yield strength is 18. 7 MPa, the elongation rate of 8.5%. (2) has been tested for large strain rolling of AlMgSiCu alloy. According to the study, the rolling rate, the amount of pass deformation and the rolling temperature are affected. Through the further exploration of the above three factors, it is concluded that the properties of the AlMgSiCu alloy are obviously improved after the 10s-1 strain rate hot rolling and the solid solution aging. At this time, the hardness value reaches 103.3HV, the tensile strength reaches 350MPa, the elongation reaches to 35.5%. (3) and the rational optimization of the main alloy element content and the proportion of adding trace element content can effectively improve the strengthening effect and improve the microstructure and mechanical properties of the AlMgSiCu alloy. In order to improve the mechanical properties of the alloy, the tensile strength of the AlMgSiCu alloy is improved. The strength increases with the increase of Zr content, the tensile strength is up to 490MPa at 0.7%Zr, the increase of Er, the increase of the mass fraction of Mn elements, the increase of the mechanical properties of the alloy, the tensile strength of 0.7%Mn to 493MPa, Zr, and Mn elements can significantly improve the microstructure and mechanical properties of AlMgSiCu alloy. (4) judging the alloy by the determination of modulus and damping value. Noise reduction and noise reduction performance. Under different processes, the damping values are different. In general, the damping value is easier to appear in the rolling state, and the modulus of elasticity is easy to have the lowest value. A large number of dislocations are formed in the alloy after the deformation of different rolling rates. The difference of the movable dislocation density is larger, and the difference in the performance of AlMgSiCu alloy is more obvious. After that, the rolling rate has the same law on the damping characteristic of AlMgSiCu aluminum alloy, and the elastic modulus decreases linearly with the increase of temperature. At room temperature and high temperature, the effect of frequency on alloy damping is different.

【學(xué)位授予單位】：廣西科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG339

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