【摘要】：在溫度分別為300°C和450°C條件下對(duì)AA7150鋁合金進(jìn)行高應(yīng)變速率(10 s~(-1))熱壓縮實(shí)驗(yàn)。結(jié)合差熱分析和透射電子顯微鏡對(duì)其不同應(yīng)變下熱變形過(guò)程流變行為、亞結(jié)構(gòu)演變及析出相形貌和空間分布進(jìn)行了系統(tǒng)研究。研究結(jié)果表明:AA7150鋁合金熱變形過(guò)程發(fā)生了流變軟化,在300°C條件下主要軟化機(jī)制是動(dòng)態(tài)回復(fù),而450°C條件下為連續(xù)動(dòng)態(tài)再結(jié)晶;合金熱變形過(guò)程中η相(300°C)及Al_3Zr粒子(450°C)隨應(yīng)變的增加分布不均勻;T相中的銅含量隨溫度升高而增加且有從T相向S相轉(zhuǎn)變的趨勢(shì),且隨變形量的增加逐漸呈線性排列;顯微組織還顯示了動(dòng)態(tài)析出及粒子誘發(fā)形核再結(jié)晶直接相關(guān)的形貌特征。
[Abstract]:The high strain rate (10s ~ (-1) thermal compression experiments of AA7150 aluminum alloy were carried out at temperatures of 300 擄C and 450 擄C, respectively. The rheological behavior, the evolution of substructure and the morphology and spatial distribution of precipitates in different strain were studied by differential thermal analysis (DTA) and transmission electron microscope (TEM). The results show that rheological softening occurs in the hot deformation process of AA7150 aluminum alloy, the main softening mechanism is dynamic recovery at 300 擄C and continuous dynamic recrystallization at 450 擄C. During hot deformation, 畏 phase (300 擄C) and Al_3Zr particle (450 擄C) distributed unevenly with the increase of strain. The copper content in T phase increases with the increase of temperature and tends to change from T phase to S phase, and it is linearly arranged with the increase of deformation, and the microstructure also shows the morphology characteristics of dynamic precipitation and particle induced nucleation and recrystallization.
【作者單位】： 湖南大學(xué)材料科學(xué)與工程學(xué)院;Department
【基金】：Project(20130161110007) supported by the Doctoral Program of the Ministry of Education,China Project(CX2013B128) supported by Hunan Provincial Innovation Foundation for Postgraduate,China Project(201306130021) supported by the Chinese Scholarship Council
【分類號(hào)】：TG146.21

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 郭會(huì)光,張巧麗,游曉紅,盧志永,竇立軍;35CrMo鋼熱變形機(jī)制的模擬研究[J];大型鑄鍛件;2000年02期

2 孟勇,苗恩銘,費(fèi)業(yè)泰;提高熱變形實(shí)驗(yàn)精度的兩種方法[J];黑龍江科技學(xué)院學(xué)報(bào);2005年01期

3 張淵;彭煥杰;蕭幼培;;熱變形在微量進(jìn)給機(jī)構(gòu)中的應(yīng)用[J];太原工學(xué)院學(xué)報(bào);1961年01期

4 奧山繁樹(shù),河村末久,尹孟年;磨削中干涉區(qū)內(nèi)的溫度分布和局部熱變形[J];機(jī)床;1981年01期

5 小林;與熱變形作斗爭(zhēng)[J];世界制造技術(shù)與裝備市場(chǎng);1997年01期

6 苗恩銘;溫度場(chǎng)中零件熱變形的力學(xué)模型轉(zhuǎn)化[J];工具技術(shù);2005年06期

7 宋鴻武;張士宏;程明;李臻熙;曹春曉;;鈦合金熱變形過(guò)程中裂紋缺陷的預(yù)測(cè)[J];稀有金屬材料與工程;2012年05期

8 惲世昌;;用反變形抵消機(jī)床熱變形的影響[J];磨床與磨削;1981年04期

9 葉瑞汶;機(jī)械焊接結(jié)構(gòu)熱變形的控制[J];組合機(jī)床與自動(dòng)化加工技術(shù);1986年05期

10 段牧忻;熱變形對(duì)釩白口鑄鐵沖擊韌性的影響[J];物理測(cè)試;2002年04期

相關(guān)會(huì)議論文 前8條

1 張克輝;樊丁;張建斌;周t，

本文編號(hào)：2345290