本文選題：Al-Zn-Mg-Cu　切入點：稀土　出處：《沈陽大學》2015年碩士論文　論文類型：學位論文

【摘要】：Al-Zn-Mg-Cu系列合金與其他系列鋁合金相比,具有強度高,密度低等許多優(yōu)點,綜合性能比較好,具有很好的應用前景。稀土元素添加到合金中很常見,但是關于在合金中復合添加Ce與Er的報道不多。本文將采用了掃描電鏡(SEM)、萬能試樣拉伸機、金相顯微鏡(OM)等手段研究單獨添加Ce與復合添加(Ce、Er)對鑄態(tài)Al-Zn-Mg-Cu組織和性能的影響,探討不同的稀土添加量對合金的作用。鑄態(tài)合金經過均勻化后,進行冷軋,探究在不同的時效時間處理下,對冷軋后的合金組織和性能的影響。(1)稀土元素Ce對鑄態(tài)Al-Zn-Mg-Cu組織在一定范圍內很好的的細化作用,添加Ce的量為0.1%時,合金的晶粒開始細化,合金的綜合力學性能開始提高;本實驗添加0.2%細化的效果比較好,抗拉強度達到220MPa,硬度值達到72HRB;當繼續(xù)添加到0.3%,晶粒開始變的粗大,力學性能下降,但比未添加時效果要好。(2)Ce和Er復合添加對鑄態(tài)的Al-Zn-Mg-Cu組織也有很好的細化作用,復合添加Ce與Er的含量0.1%時,合金抗拉強度比未添加時提高了20.1%。本實驗復合添加量為0.2%時細化效果較好,抗拉強度比單獨添加稀土含量為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,進行冷軋,冷軋過后進行420保溫退火處理,再進行不同時間的時效處理,當時效時間為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.
【學位授予單位】：沈陽大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG146.21

【參考文獻】

相關期刊論文 前7條

1 霍日昌;史志銘;袁曉鳴;;冷變形對5182鋁合金組織的影響[J];內蒙古科技大學學報;2011年02期

2 谷亦杰,林建國,張永剛,陳昌麒;回歸再時效(RRA)處理對7050鋁合金的影響[J];金屬熱處理;2001年01期

3 王東;馬宗義;;固溶處理后冷軋變形7050鋁合金時效工藝研究[J];金屬學報;2010年05期

4 夏卿坤;劉志義;林亮華;劉煜;許曉嫦;陳旭;;冷軋變形對Al-Zn-Mg-Cu鋁合金剝落腐蝕性能的影響[J];材料熱處理學報;2012年S2期

5 高平;張文波;狄石磊;李進軍;邸建輝;楊春霞;辛士進;范秉源;;稀土6063鋁合金熱變形性能研究[J];熱處理;2011年02期

6 夏濤;陳子勇;聶祚仁;;高鋅超高強鋁合金微觀組織及力學性能研究[J];熱加工工藝;2015年02期

7 林高用,張輝,張行健,韓冬峰,張穎,彭大暑;Influences of processing routine on mechanical properties and structures of 7075 aluminum alloy thick-plates[J];Transactions of Nonferrous Metals Society of China;2003年04期

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