不同熱變形條件下Al-Zn-Mg-Cu包鋁板的組織演變(英文)
本文選題:Al-Zn-Mg-Cu合金 + 包鋁層; 參考:《Transactions of Nonferrous Metals Society of China》2017年08期
【摘要】:利用Gleeble-3500熱模擬試驗機對Al-Zn-Mg-Cu包鋁板進行熱變形,采用EBSD和XRD對不同變形條件下的Al-Zn-Mg-Cu基體和包鋁層顯微結(jié)構(gòu)進行表征,其變形條件為變形量70%、溫度380~450°C、應(yīng)變速率0.1~30 s~(-1)。結(jié)果表明,變形溫度、道次和變形速率直接影響樣品的回復(fù)和再結(jié)晶過程,從而進一步影響其顯微結(jié)構(gòu)。在包鋁層和Al-Zn-Mg-Cu基體中回復(fù)和再結(jié)晶的程度有所區(qū)別。較高的變形溫度導(dǎo)致較高程度的再結(jié)晶以及較大的晶粒尺寸。在多道次變形中的停留時間內(nèi)會發(fā)生靜態(tài)再結(jié)晶。當(dāng)應(yīng)變速率低于10 s~(-1)時,隨著應(yīng)變速率的增大,出現(xiàn)較多細(xì)小的亞晶組織;然而,在30 s~(-1)的大應(yīng)變速率條件下,試樣在變形溫度下停留時間較短,導(dǎo)致動態(tài)回復(fù)及再結(jié)晶程度受限。
[Abstract]:The thermal deformation of Al-Zn-Mg-Cu coated aluminum plate was made by Gleeble-3500 thermal simulation test machine. The microstructure of Al-Zn-Mg-Cu matrix and aluminum coating under different deformation conditions was characterized by EBSD and XRD. The deformation conditions were 70% deformation, 380~450 degree C, and 0.1~30 s~ (-1) at strain rate. The results showed that the deformation temperature, pass and deformation rate were direct. The recovery and recrystallization of the sample affect its microstructure further. The degree of recovery and recrystallization in the aluminum coating and the Al-Zn-Mg-Cu matrix is different. Higher deformation temperature leads to higher recrystallization and larger grain size. Static recrystallization will occur during the residence time in the multipass deformation. When the strain rate is less than 10 s~ (-1), with the increase of the strain rate, there are many fine subcrystalline structures. However, under the condition of the large strain rate of 30 s~ (-1), the retention time of the specimen at the deformation temperature is shorter, which leads to the limited degree of dynamic recovery and recrystallization.
【作者單位】: 重慶大學(xué)材料科學(xué)與工程學(xué)院;中鋁材料應(yīng)用研究院有限公司蘇州分公司;
【基金】:Projects(2016YFB0300901,2016YFB0700401) supported by the National Key Research and Development Program of China Projects(106112015CDJXY130003,106112015CDJXZ138803) supported by the Fundamental Research Funds for the Central Universities,China
【分類號】:TG146.21
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