本文選題：鋁鋅合金 + 阻尼性能��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：鋅鋁基合金因其優(yōu)異的機(jī)械性能、耐磨性、阻尼性能及低廉的成本,被廣泛應(yīng)用于替代傳統(tǒng)材料生產(chǎn)軸承、軸瓦、滑塊等部件。大多數(shù)國(guó)內(nèi)外學(xué)者的研究多集中在Zn含量高于50wt.%的鋅鋁合金,而對(duì)于Zn含量低于50wt.%的鋁鋅合金研究較少。鋁鋅合金與鋅鋁合金相比由于Zn含量低,具有質(zhì)量輕的優(yōu)勢(shì)且具有一定阻尼性能。為更多更好地了解鋁鋅合金,本文對(duì)鋁鋅合金進(jìn)行了研究。本課題為確定合適的合金成分,以獲得阻尼性能優(yōu)異、力學(xué)性能良好的輕量化鋁鋅合金,分別熔煉了 Al-25wt.%Zn,Al-35wt.%Zn和Al-45wt.%Zn三種成分的鋁鋅合金并進(jìn)行了均勻化熱處理,通過(guò)優(yōu)化選取Al-45wt.%Zn,并向Al-45wt.%Zn合金中分別加入了 0.4wt.%,0.6wt.%,0.8wt.%的Ti和Zr,再次選定最優(yōu)成分后又分別進(jìn)行了 380℃×3h+400℃×1h,370℃×10h+180℃×6h,350℃×2h+200℃×1Oh 的熱處理實(shí)驗(yàn)。通過(guò)金相顯微觀察、X-射線衍射、阻尼性能測(cè)試、室溫拉伸試驗(yàn)、顯微硬度測(cè)試對(duì)試樣進(jìn)行了組織性能對(duì)比,得到的研究成結(jié)果如下:(1)在本文研究的二元合金中,Zn含量的越多,合金的阻尼性能越好。Al-45wt.%Zn合金的晶粒最細(xì),共析強(qiáng)化相最多,使得可動(dòng)界面的數(shù)量最多,因此,Al-45wt.%Zn合金表現(xiàn)出性能最優(yōu),其阻尼值為0.012,分別比Al-25wt.%Zn和Al-35wt.%Zn合金的阻尼值提高了 50%和16.7%�？估瓘�(qiáng)度為243.1MPa,屈服強(qiáng)度為198.8MPa,伸長(zhǎng)率為3.7%,硬度為 85.9HV。(2)(Al-45wt.%Zn)-0.6wt.%Ti 和(Al-45wt.%Zn)-0.6wt.%Zr 的阻尼性能最優(yōu),阻尼值分別為0.014和0.013。相比于二元Al-45wt.%Zn合金阻尼值分別提高了 16.7%和8.3%,加入0.4wt.%Ti和0.4wt.%Zr可以細(xì)化晶粒;加入0.6wt.%Ti和0.6wt.%Zr能與A1生成金屬間化合物,作為異質(zhì)形核的核心,彌散強(qiáng)化,增加晶界。加入0.6wt.%Ti的鑄態(tài)合金的硬度值為94.6HV、比二元合金提高了 10.1%,但低于加入0.8wt.%Ti的鑄態(tài)合金,其硬度值101.3HV;加入0.6wt.%Zr的硬度最強(qiáng),為96.2HV,比二元合金提高了 12%。一方面晶粒的細(xì)化可以增強(qiáng)合金的硬度,另一方面過(guò)量的金屬間化合物會(huì)析出在晶界,阻礙晶界的可動(dòng)性,對(duì)硬度有貢獻(xiàn)作用。(3)熱處理 350℃×2h+200℃×1Oh 對(duì)(Al-45wt.%Zn)-0.6wt.%Ti,370℃×10h+180℃×6h對(duì)(Al-45wt.%Zn)-0.6wt.%Zr三元鑄態(tài)阻尼性能改善效果最好,阻尼值分別達(dá)到了 0.0175和0.018,相比于Al-45wt.%Zn二元合金分別提高了 45.8wt.%和50%,相比于(Al-45wt.%Zn)-0.6wt.%Ti 和(Al-45wt.%Zn)-0.6wt.%Zr 三元鑄態(tài)合金分別提高了25%和38.5wt.%;抗拉強(qiáng)度分別為214.2MPa和222.4MPa,屈服強(qiáng)度分別為209.8MPa和214.3MPa,與二元合金相差不大;拉伸率分別為16.1wt.%和15.9%,相比于二元Al-45wt.%Zn合金分別提高了 335%和330wt.%;硬度分別為128.7HV和113.7HV,相比于二元 Al-45wt.%Zn 合金分別提高了 49.8%和 32.4wt.%,相較于(Al-45wt.%Zn)-0.6wt.%Ti 和(Al-45wt.%Zn)-0.6wt.%Zr 三元鑄態(tài)合金分別提高了 36wt.%和 18.2wt.%,綜合性能最好。熱處理提高阻尼性能的原因是溫度升高,加熱時(shí)間增長(zhǎng),一些鑄態(tài)時(shí)的非平衡相分解,成分趨于均勻化,層片狀共析相逐漸轉(zhuǎn)變?yōu)榱?將共格界面轉(zhuǎn)變?yōu)榉枪哺窠缑?晶粒細(xì)化,阻尼性能增強(qiáng)。晶界中的低熔點(diǎn)共晶物溶解,界面可動(dòng)性增強(qiáng),阻尼性能提高的同時(shí)塑性增強(qiáng),強(qiáng)度降低;η硬相增多,強(qiáng)度增大。
[Abstract]:The zinc aluminum alloy because of its excellent mechanical properties, abrasion resistance, damping performance and low cost, is widely used in the production of traditional materials instead of bearings, bearing, slide and other components. Most of the research scholars at home and abroad are more concentrated in the Zn Aluminum Alloy zinc content is higher than 50wt.%, and for Zn was lower than that of aluminum zinc alloy study of 50wt.%. Aluminum zinc alloy and zinc Aluminum Alloy compared due to the low content of Zn has the advantages of light weight and has certain damping properties. For more and better understanding of aluminum zinc alloy, this paper studied the aluminum zinc alloy. This subject is sure to obtain suitable alloy composition, excellent damping performance, light quantification of Al Zn alloy with good mechanical properties of Al-25wt.%Zn, Al-35wt.%Zn and Al-45wt.%Zn were melting, three components of aluminum zinc alloy and the homogenization heat treatment, Al-45wt.%Zn is selected through optimization, and to the Al-45wt.%Zn alloy Add to 0.4wt.% 0.6wt.%, 0.8wt.%, Ti and Zr, and then again to select the optimal components were 380 DEG C C * 3h+400 * 1H, 10h+180 * 6h * 370 DEG C, the heat treatment experiment 350 c * 2h+200 * C 1Oh. Through metallographic observation, X- ray diffraction, damping performance test, room temperature tensile test, microhardness test of the organizational performance comparison on the sample, the research results are as follows: (1) in the two alloys in this study, the content of Zn increasing, the grain better damping properties of.Al-45wt.%Zn alloy alloy of the finest, most eutectoid strengthening phase, so that the number of the most moving interface, so Al-45wt.%Zn, the alloy exhibits the best performance, the damping value is 0.012, respectively Al-25wt.%Zn and Al-35wt.%Zn alloy damping values increased by 50% and 16.7%. 243.1MPa for the tensile strength, yield strength is 198.8MPa, elongation is 3.7%, the hardness is 85.9HV. (2) (Al- 45wt.%Zn) and -0.6wt.%Ti (Al-45wt.%Zn) -0.6wt.%Zr optimal damping properties, damping values were 0.014 and two yuan 0.013. compared to Al-45wt.%Zn alloy damping values were increased by 16.7% and 8.3%, adding 0.4wt.%Ti and 0.4wt.%Zr can refine grain; adding 0.6wt.%Ti and 0.6wt.%Zr to form intermetallics and A1 as heterogeneous nucleation core, dispersion strengthening increase, join the 0.6wt.%Ti grain boundaries. The hardness of the alloy is 94.6HV, 10.1% higher than two yuan but less than that of 0.8wt.%Ti alloy, joined the cast alloy, the hardness of 101.3HV value; adding 0.6wt. hardness of%Zr is 96.2HV, the strongest, two yuan more than the alloy improves hand grain refinement of 12%. alloy can be enhanced the hardness, on the other hand excessive intermetallic compounds will be precipitated at the grain boundary, grain boundary mobility hinder, contribute to the hardness. (3) heat treatment at a temperature of 350 DEG C * 2h+ * 1Oh (Al-45 to 200 DEG C Wt.%Zn -0.6wt.%Ti, 370 10h+180) C + C + 6h (Al-45wt.%Zn) -0.6wt.%Zr of three yuan cast the best damping capacity improvement effect, the damping value reached 0.0175 and 0.018, compared to two yuan Al-45wt.%Zn alloy were increased by 45.8wt.% and 50%, compared to the (Al-45wt.%Zn) -0.6wt.%Ti and -0.6wt.%Zr (Al-45wt.%Zn) three yuan cast alloy were increased by 25% and 38.5wt.%; 214.2MPa and 222.4MPa respectively, the tensile strength, yield strength were 209.8MPa and 214.3MPa, and the two element alloy difference; the stretching rate was 16.1wt.% and 15.9% respectively, compared to two yuan Al-45wt.%Zn alloy were increased by 335% and 330wt.%; the hardness of 128.7HV and 113.7HV, compared to two yuan Al-45wt.%Zn alloy were increased by 49.8% and 32.4wt.%, compared to the (Al-45wt.%Zn) -0.6wt.%Ti and -0.6wt.%Zr (Al-45wt.%Zn) three yuan cast alloy are increased by 36wt.% and 18.2wt.%, comprehensive The best performance. To improve the damping performance of the heat treatment temperature increased, the heating time increases, some cast the non-equilibrium phase decomposition, composition uniformity, lamellar eutectoid phase gradually transformed into granular, the coherent interface into non coherent interface, grain refinement, enhance the damping performance of the grain boundary. Low melting point eutectic dissolved, the interface mobility enhancement, damping performance improves increased plasticity and strength reduction; ETA hard phase increase, the strength increased.

【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG146.21

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本文編號(hào)：1770813