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高應(yīng)變速率軋制對Mg-4Zn合金組織及性能的影響
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湖南大學(xué)材料科學(xué)與工程學(xué)院,湖南大學(xué)材料科學(xué)與工程學(xué)院,湖南大學(xué)材料科學(xué)與工程學(xué)院,湖南大學(xué)材料科學(xué)與工程學(xué)院,湖南大學(xué)材料科學(xué)與工程學(xué)院,湖南大學(xué)材料科學(xué)與工程學(xué)院,湖南大學(xué)材料科學(xué)與工程學(xué)院

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中圖分類號:

TG146.2；R 318.08

基金項目:

國家自然科學(xué)基金（51571089）；教育部博士點基金 (20120161110040)；國家級SIT創(chuàng)新實驗項目


Effects of high strain-rate rolling on microstructure and properties of the Mg-4Zn alloy
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Affiliation:

School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China,School of Materials Science and Engineering,Hunan University,Changsha,China

Fund Project:

National High Technology Research and Development Program of China (“863” Program) (2009AA05Z120)

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    摘要:

    采用光學(xué)顯微鏡、掃描電鏡、浸泡質(zhì)量損失和拉伸測試等手段研究了高應(yīng)變速率軋制對Mg-4Zn合金微觀組織、力學(xué)性能及耐腐蝕性能的影響。結(jié)果表明：固溶處理后進行高應(yīng)變速率軋制，Mg-4Zn合金發(fā)生了均勻的動態(tài)再結(jié)晶，平均晶粒尺寸為4 μm，力學(xué)性能明顯改善，抗拉強度、屈服強度和伸長率分別為285 MPa、180 MPa和27.4%。固溶態(tài)、軋制態(tài)合金由于第二相含量及尺寸明顯小于鑄態(tài)，腐蝕方式為較均勻的絲狀腐蝕，耐蝕性大大提高。Hank’s溶液中浸泡15 d實驗表明，軋制態(tài)耐蝕性最佳，平均腐蝕速率為0.25 mg/cm2?d，約為鑄態(tài)的1/5；其剩余抗拉強度最高為215 MPa，遠高于鑄態(tài)和固溶態(tài)。

    Abstract:

    Effects of high strain-rate rolling on microstructure, mechanical properties and corrosion resistance of Mg-4Zn alloy were investigated by optical microscope (OM), scanning electron microscope (SEM), mass loss of immersion test and tensile testing. The results showed that high strain-rate rolling after solution treatment produced homogenous dynamic recrystallization (DRX) with final grain size of 4 μm leading to a significant mechanical property improvement. The tensile strength, yield strength and elongation were 285MPa, 180MPa and 27.4% respectively. The solutionized and the as-rolled alloys had better corrosion resistance than the as-cast, exhibiting a uniform filiform corrosion due to the lower fraction and the finer size of the second phase. The as-rolled alloy showed the best corrosion resistance with the average corrosion rate of 0.25 mg/cm2.d, about 1/5 of the as-cast alloy after soaking in Hank’s solution for 15 days. It also showed the highest residual tensile strength ( 215MPa), far above the as-cast and the solutionized alloys.

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陳吉華,鄒正陽,嚴紅革,謝蕊鴻,施揚健,鞏曉樂,黃姜凌.高應(yīng)變速率軋制對Mg-4Zn合金組織及性能的影響[J].稀有金屬材料與工程,2017,46(8):2220~2226.[Chen Jihua, Zou Zhengyang, Yan Hongge, Xie Ruihong, Shi Yangjian, Gong Xiaole, Huang Jiangling. Effects of high strain-rate rolling on microstructure and properties of the Mg-4Zn alloy[J]. Rare Metal Materials and Engineering,2017,46(8):2220~2226.]
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  • 收稿日期:2015-04-13
  • 最后修改日期:2015-12-11
  • 錄用日期:2015-12-11
  • 在線發(fā)布日期: 2017-11-16
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