17Al12相"/> 17Al12相數(shù)量顯著減少,部分脆性Mg17Al12相發(fā)生斷裂,以小顆粒狀彌散分布于晶界附近和基體內(nèi)部。均勻化后軋制組織比原始軋制組織強(qiáng)度略有提高,而伸長率提高達(dá)50%。軋制后的拉伸斷口形貌也顯示合金塑性得到明顯改善。這為后續(xù)進(jìn)一步研究AZ91鎂合金在不同工藝參數(shù)條件下的軋制成形奠定基礎(chǔ)。"/>

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均勻化退火處理對AZ91鎂合金軋制成形行為的影響
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太原理工大學(xué)材料科學(xué)與工程學(xué)院,太原理工大學(xué)材料科學(xué)與工程學(xué)院,太原理工大學(xué)材料科學(xué)與工程學(xué)院,太原理工大學(xué)材料科學(xué)與工程學(xué)院,太原理工大學(xué)材料科學(xué)與工程學(xué)院,太原理工大學(xué)材料科學(xué)與工程學(xué)院

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TG146.2

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國家自然科學(xué)基金資助(項(xiàng)目號(hào)51474152)


Effect of Homogenizing annealing treatment on AZ91 magnesium alloy rolling deformation behavior
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College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi Taiyuan Key Laboratory of Advanced Magnesium Based Materials of Shanxi Province,Shanxi Taiyuan

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    摘要:

    為改善鑄態(tài)AZ91鎂合金組織不均勻性,提高其軋制成形能力,本文研究了均勻化退火處理對AZ91鎂合金軋制變形前后微觀組織及力學(xué)性能的影響。實(shí)驗(yàn)結(jié)果表明：均勻化退火處理可以有效改善合金組織中第二相分布；經(jīng)400℃、多道次軋制后,沿晶界附近分布的細(xì)長條狀Mg17Al12相數(shù)量顯著減少,部分脆性Mg17Al12相發(fā)生斷裂,以小顆粒狀彌散分布于晶界附近和基體內(nèi)部。均勻化后軋制組織比原始軋制組織強(qiáng)度略有提高,而伸長率提高達(dá)50%。軋制后的拉伸斷口形貌也顯示合金塑性得到明顯改善。這為后續(xù)進(jìn)一步研究AZ91鎂合金在不同工藝參數(shù)條件下的軋制成形奠定基礎(chǔ)。

    Abstract:

    To improve the inhomogeneity and rolling forming ability of as-cast AZ91 magnesium, the effect of homogenizing annealing treatment on microstructure and mechanical properties of AZ91 magnesium alloy before and after rolling deformation was studied. The results showed that the distribution of second phase in the alloy tissue was improved effectively after homogenization annealing treatment. After multi-pass rolling at 400℃, the thin strip Mg17Al12 phase which originally distributed along the grain boundaries reduces significantly, with some of them fragmented, and some distributed near the grain boundaries or inside the grains as small particles. Compared with the strength of as-cast rolling structure, the strength of rolling structure after homogenization increases slightly; while the elongation increases by 50%.The tensile fracture morphology after rolling also shows that the ductility of alloy improves significantly. This lays a foundation for further study on the rolling forming of AZ91 magnesium alloy under different technological parameters.

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鄭留偉,梁偉,趙子龍,李亞娥,王紅霞,王一德.均勻化退火處理對AZ91鎂合金軋制成形行為的影響[J].稀有金屬材料與工程,2016,45(5):1296~1301.[Zheng Liuwe, Liang Wei, Zhao Zilong, Li Yae, Wang Hongxia, Wang Yide. Effect of Homogenizing annealing treatment on AZ91 magnesium alloy rolling deformation behavior[J]. Rare Metal Materials and Engineering,2016,45(5):1296~1301.]
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  • 收稿日期:2015-05-07
  • 最后修改日期:2015-08-06
  • 錄用日期:2015-09-07
  • 在線發(fā)布日期: 2016-06-02
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