本文選題：Al-Zn-Mg-Cu　切入點(diǎn)：稀土　出處：《沈陽(yáng)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：Al-Zn-Mg-Cu系列合金與其他系列鋁合金相比,具有強(qiáng)度高,密度低等許多優(yōu)點(diǎn),綜合性能比較好,具有很好的應(yīng)用前景。稀土元素添加到合金中很常見(jiàn),但是關(guān)于在合金中復(fù)合添加Ce與Er的報(bào)道不多。本文將采用了掃描電鏡(SEM)、萬(wàn)能試樣拉伸機(jī)、金相顯微鏡(OM)等手段研究單獨(dú)添加Ce與復(fù)合添加(Ce、Er)對(duì)鑄態(tài)Al-Zn-Mg-Cu組織和性能的影響,探討不同的稀土添加量對(duì)合金的作用。鑄態(tài)合金經(jīng)過(guò)均勻化后,進(jìn)行冷軋,探究在不同的時(shí)效時(shí)間處理下,對(duì)冷軋后的合金組織和性能的影響。(1)稀土元素Ce對(duì)鑄態(tài)Al-Zn-Mg-Cu組織在一定范圍內(nèi)很好的的細(xì)化作用,添加Ce的量為0.1%時(shí),合金的晶粒開(kāi)始細(xì)化,合金的綜合力學(xué)性能開(kāi)始提高;本實(shí)驗(yàn)添加0.2%細(xì)化的效果比較好,抗拉強(qiáng)度達(dá)到220MPa,硬度值達(dá)到72HRB;當(dāng)繼續(xù)添加到0.3%,晶粒開(kāi)始變的粗大,力學(xué)性能下降,但比未添加時(shí)效果要好。(2)Ce和Er復(fù)合添加對(duì)鑄態(tài)的Al-Zn-Mg-Cu組織也有很好的細(xì)化作用,復(fù)合添加Ce與Er的含量0.1%時(shí),合金抗拉強(qiáng)度比未添加時(shí)提高了20.1%。本實(shí)驗(yàn)復(fù)合添加量為0.2%時(shí)細(xì)化效果較好,抗拉強(qiáng)度比單獨(dú)添加稀土含量為0.2%Ce的合金提高了10.5%,延伸率提高了7.8%,硬度值提高了6.4%。(3)鑄錠均勻化處理后,進(jìn)行冷軋,冷軋過(guò)后進(jìn)行420保溫退火處理,再進(jìn)行不同時(shí)間的時(shí)效處理,當(dāng)時(shí)效時(shí)間為120/8h,合金的性能最好,硬度出現(xiàn)峰值。
[Abstract]:Compared with other series of aluminum alloys, Al-Zn-Mg-Cu series alloys have many advantages, such as high strength, low density and so on. However, there are few reports on the addition of ce and er in the alloy. In this paper, the effects of ce and ce on the microstructure and properties of as-cast Al-Zn-Mg-Cu are studied by means of scanning electron microscope (SEM), universal specimen drawing machine and metallographic microscope. The effects of different rare earth additions on the alloy were discussed. After homogenization, the as-cast alloy was rolled in cold, and the effect of different aging time was investigated. Effect of rare Earth element ce on the Microstructure and Properties of Cold rolled Alloy. The rare earth element ce has a good refining effect on the as-cast Al-Zn-Mg-Cu structure within a certain range. When the addition of ce is 0.1, the grain size of the alloy begins to refine and the comprehensive mechanical properties of the alloy begin to improve. In this experiment, the effect of adding 0.2% thinning is better, the tensile strength is 220 MPA, the hardness value is 72 HRB.When the addition of 0.2% is continued, the grain size becomes coarse and the mechanical properties decrease. But the effect is better than that without adding. The addition of ce and er can also refine the Al-Zn-Mg-Cu structure of as-cast state, and when the content of ce and er is 0.1%, the structure of as-cast Al-Zn-Mg-Cu can be further refined. The tensile strength of the alloy was increased by 20.1g than that of the alloy without addition. The tensile strength was increased by 10.5, the elongation by 7.8 and the hardness by 6.4. after the ingot was homogenized, the alloy was cold-rolled and annealed with 420 heat preservation after cold rolling, compared with the alloy with 0.2 RE content added alone, and the tensile strength was increased by 10.5%, the elongation of the alloy was increased by 7.8%, and the hardness value was increased by 6.44%. When the aging time is 120 / 8 h, the properties of the alloy are the best and the hardness peak.
【學(xué)位授予單位】：沈陽(yáng)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG146.21

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本文編號(hào)：1560272