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軋前深冷處理對(duì)AZ31鎂合金顯微組織和力學(xué)性能的影響
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太原科技大學(xué)重型機(jī)械教育部工程研究中心,,太原科技大學(xué)重型機(jī)械教育部工程研究中心,太原科技大學(xué)重型機(jī)械教育部工程研究中心,太原科技大學(xué)重型機(jī)械教育部工程研究中心,太原科技大學(xué)重型機(jī)械教育部工程研究中心

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國(guó)家自然科學(xué)基金青年項(xiàng)目（51604181），山西煤基低碳聯(lián)合基金(U1510131)，山西省重點(diǎn)研發(fā)計(jì)劃(201603D121010)，山西省應(yīng)用基礎(chǔ)研究計(jì)劃(201601D021095)，山西省高等學(xué)?？萍紕?chuàng)新項(xiàng)目(2015172)


Effect of cryogenic treatment prior rolling on microstructure and mechanical properties of AZ31 magnesium alloy
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Heavy Machinery Engineering Research Center of the Ministry of Education,Taiyuan University of Science and Technology,Taiyuan, China,Guangxi Liuzhou Iron and Steel Group Company Limited,Liuzhou,Heavy Machinery Engineering Research Center of the Ministry of Education,Taiyuan University of Science and Technology,Taiyuan, China,Heavy Machinery Engineering Research Center of the Ministry of Education,Taiyuan University of Science and Technology,Taiyuan, China,Heavy Machinery Engineering Research Center of the Ministry of Education,Taiyuan University of Science and Technology,Taiyuan, China,Heavy Machinery Engineering Research Center of the Ministry of Education,Taiyuan University of Science and Technology,Taiyuan, China

Fund Project:

National Natural Science Foundation of China (NO. 51604181), Coal Based Low Carbon Joint Fund of Shanxi Province(NO.U1510131), the Key Research and Development Program of Shanxi Province (NO. 201603D121010), Applied Basic Research Program of Shanxi Province (NO.201601D021095), Project of University Science and Technology Innovation of Shanxi Province (2015172)

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    摘要:

    本文通過(guò)對(duì)鑄態(tài)AZ31鎂合金經(jīng)不同條件的深冷處理繼而熱軋,分析其強(qiáng)度、韌性、延展性效應(yīng)及其規(guī)律。深冷實(shí)驗(yàn)條件分別為-60℃/12h、-120℃/12h、-180℃/12h、-60℃/2h和-180℃/2h。結(jié)果表明：AZ31經(jīng)適宜的深冷處理,晶粒得到細(xì)化,強(qiáng)度、韌性及延展性得到有效提高；與未經(jīng)深冷處理試樣相比,深冷處理時(shí)間為2h的兩種試樣中都出現(xiàn)大量孿晶；經(jīng)-60℃/12h深冷處理后再進(jìn)行軋制試樣的顯微組織最為細(xì)小均勻,屈服強(qiáng)度提高了25.8%,而延伸率則更是提高了4倍,由3.06%提高到了12.31%；深冷處理后的AZ31鎂合金斷口呈現(xiàn)出脆性斷裂和塑性斷裂集合的復(fù)合性斷裂特征。

    Abstract:

    The effects of cryogenic treatment prior hot rolling on the strength toughness and ductility of as-cast AZ31 magnesium alloy plate was investigated in this study. The cryogenic treatment conditions were ?60 °C/12 h, ?120 °C/12 h, ?180 °C/12 h, ?60 °C/2 h, and ?180 °C/2 h. Experimental results indicated that appropriate cryogenic treatment conditions can significantly refine the grain size and the strength, toughness and ductility were also improved. A large number of twins appeared in both kinds of samples cryogenically treated for 2 h. The grain size of the sample, which experienced cryogenic treatment for 12 h at ?60 °C followed by rolling process was the finest and most uniform. By increasing cryogenic treatment duration to 12 h, the yield strength of the AZ31 magnesium alloy was enhanced by 25.8% after rolling under ?60 °C cryogenic treatment temperature. Meanwhile, a four-time increase in extension rate (3.06% to 12.31%) was attained. The tensile fracture presented a mixed-mode fracture, which is characteristic of brittle and ductile fracture mechanisms.

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黃志權(quán),韋建春,黃慶學(xué),馬立峰,高翔宇,岳照涵.軋前深冷處理對(duì)AZ31鎂合金顯微組織和力學(xué)性能的影響[J].稀有金屬材料與工程,2018,47(10):2942~2948.[Huang Zhiquan, Wei Jianchun, Huang Qingxue, Ma Lifeng, Gao Xiangyu, Yue Zhaohan. Effect of cryogenic treatment prior rolling on microstructure and mechanical properties of AZ31 magnesium alloy[J]. Rare Metal Materials and Engineering,2018,47(10):2942~2948.]
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  • 收稿日期:2017-03-19
  • 最后修改日期:2017-07-10
  • 錄用日期:2017-08-16
  • 在線發(fā)布日期: 2018-11-08
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