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流變軋制AZ91合金的熱處理和組織性能調控
作者:
作者單位:

1.東北大學材料科學與工程學院;2.中信戴卡研究院;3.天津理工大學

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基金項目:

國家自然科學基金項目（面上項目，重點項目，重大項目）：51771045, U1764254, and 51974083；遼寧省科技廳項目：XLYC1802128


Tailoring the microstructure and mechanical properties of AZ91 alloy by rheo-rolling and heat treatment
Author:
Affiliation:

1.Key Laboratory of Lightweight Structural Materials Liaoning Province,School of Materials Science and Engineering,Northeastern University;2.The CITIC Dicastal Institute

Fund Project:

National Natural Science Foundation of China (51771045, U1764254, and 51974083); Department of Science & Technology of Liaoning Province (XLYC1802128)

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    摘要:

    本文對連續(xù)流變軋制AZ91合金在熱處理過程中的組織和力學性能演化進行了研究。熱處理后兩種析出相在基體中出現(xiàn)：一種是晶界處的非連續(xù)析出相,另一種是從過飽和基體中析出的小尺寸連續(xù)析出相。隨著時效溫度升高,原子擴散速度也隨之提高,導致更多的析出相生成和長大。合金的維氏硬度和拉伸強度峰值在16小時時效后出現(xiàn),而合金的延伸率隨著時效時間的延長和時效溫度的提高呈下降趨勢。經(jīng)過對實驗結果的分析,適合提升合金綜合力學性能的熱處理制度為415°C固溶20小時加220°C時效16小時。經(jīng)熱處理后得到的維氏硬度、拉伸強度和延伸率分別為：99 HV,251 MPa和4.5%,各項性能均顯著優(yōu)于流變軋制態(tài)合金。相對于傳統(tǒng)成型手段,流變軋制加熱處理方法成型的AZ91合金展現(xiàn)了優(yōu)異且均衡的綜合力學性能。

    Abstract:

    The evolution of microstructure and mechanical properties of the continuous rheo-rolled AZ91 magnesium alloy during heat treatment was revealed in the present study. Two kinds of Mg17Al12 phases precipitated from the supersaturated magnesium matrix were observed: most of which distributed discretely at grain boundary while the rest precipitated in alloy matrix in small size. With higher aging temperature, atom diffusion velocity increased and more precipitates formed. As a result, the hardness and the tensile strength peaked at 16h, whilst the elongation decreased with increasing time and temperature. The optimal comprehensive mechanical properties were obtained after solution treatment at 415 °C for 20 h and aging treatment at 220 °C for 16 h. The tailored hardness, tensile strength and elongation of the rheo-rolled alloy after heat treatment reached 99 HV, 251 MPa and 4.5%, respectively, which were significantly higher than that of the untreated alloy. Compared with traditional processing methods, rheo-rolling followed by heat treatment demonstrates its effectiveness on tailoring and obtaining balanced mechanical properties of AZ91 alloy.

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管仁國,王祥,鐵鏑,任浩博,王宇翔,劉海峰,顏路飛,陳民芳.流變軋制AZ91合金的熱處理和組織性能調控[J].稀有金屬材料與工程,2020,49(11):3718~3723.[Renguo Guan, Xiang Wang, Di Tie, Haobo Ren, Yuxiang Wang, Haifeng Liu, Lufei Yan, Minfang Chen. Tailoring the microstructure and mechanical properties of AZ91 alloy by rheo-rolling and heat treatment[J]. Rare Metal Materials and Engineering,2020,49(11):3718~3723.]
DOI：10.12442/j. issn.1002-185X.20190878

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  • 收稿日期:2019-10-24
  • 最后修改日期:2019-11-06
  • 錄用日期:2019-11-12
  • 在線發(fā)布日期: 2020-12-09
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