AA7150鋁合金高應變速率熱變形過程中顯微組織動態(tài)演變表征(英文)
發(fā)布時間:2018-11-20 15:35
【摘要】:在溫度分別為300°C和450°C條件下對AA7150鋁合金進行高應變速率(10 s~(-1))熱壓縮實驗。結(jié)合差熱分析和透射電子顯微鏡對其不同應變下熱變形過程流變行為、亞結(jié)構演變及析出相形貌和空間分布進行了系統(tǒng)研究。研究結(jié)果表明:AA7150鋁合金熱變形過程發(fā)生了流變軟化,在300°C條件下主要軟化機制是動態(tài)回復,而450°C條件下為連續(xù)動態(tài)再結(jié)晶;合金熱變形過程中η相(300°C)及Al_3Zr粒子(450°C)隨應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,且隨變形量的增加逐漸呈線性排列;顯微組織還顯示了動態(tài)析出及粒子誘發(fā)形核再結(jié)晶直接相關的形貌特征。
[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】: 湖南大學材料科學與工程學院;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】:TG146.21
[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】: 湖南大學材料科學與工程學院;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】:TG146.21
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