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鑄態(tài)Mg-3Sn-1Mn-1La鎂合金組織演變及本構(gòu)方程建立
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Taiyuan University of Science and Technology

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the Natural Science Foundation of Shanxi Province (No.: 201901D111241), Key Research and Development Program of Shanxi Province (No.: 201603D111004, 201703D111003) and Major Science and Technology Projects of Shanxi Province (No.: 20181101002) and National Natural Science Foundation of China (No.: U1610253, U610256, 51604181)


Libin Zhang1, 3, Guangming Liu1, 3*, Tingzhuang Han1, 3, Wenzhan Huang1, Rongjun Wang2, 3, Lifeng Ma2, 3
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1.School of Mechanical Engineering,Taiyuan University of Science and Technology;2.China;3.Coordinative Innovation Centre of Taiyuan Heavy Machinery Equipment,Taiyuan University of Science and Technology

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the Natural Science Foundation of Shanxi Province (No.: 201901D111241), Key Research and Development Program of Shanxi Province (No.: 201603D111004, 201703D111003) and Major Science and Technology Projects of Shanxi Province (No.: 20181101002) and National Natural Science Foundation of China (No.: U1610253, U610256, 51604181)

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    摘要:

    通過對Mg-3Sn-1Mn-1La合金在200-450℃溫度和0.001-1.0s-1應(yīng)變速率范圍內(nèi)進行等溫壓縮，研究了鑄態(tài)的Mg-3Sn-1Mn-1La合金的熱變形行為和組織演變。流變應(yīng)力隨著變形溫度的降低和應(yīng)變率的增加而明顯增加。再結(jié)晶晶粒尺寸隨溫度升高和應(yīng)變速率降低而增加。在較低的變形溫度下，連續(xù)動態(tài)再結(jié)晶是DRX的主要機理。隨著變形溫度的增加，不連續(xù)的動態(tài)再結(jié)晶成為主要再結(jié)晶機制。分析并校正了摩擦變形加熱對流動應(yīng)力的影響。結(jié)果表明，在較高的應(yīng)變速率和較低的變形溫度下，形變熱對流動應(yīng)力有顯著的影響，而摩擦作用較小。根據(jù)實驗結(jié)果，建立了應(yīng)變補償?shù)腁rrhenius型方程。將實驗數(shù)據(jù)與計算出的流動應(yīng)力進行對比，結(jié)果表明建立的本構(gòu)方程可以充分描述實驗合金的熱變形行為。

    Abstract:

    Hot deformation behavior and microstructural evolution of the as-cast Mg-3Sn-1Mn-1La alloy were investigated by isothermal compression at temperature of 200-450℃ and strain rate of 0.001-1.0s-1. The flow stress increases obviously with decreasing temperature and increasing strain rate. The recrystallized grain size increases with increasing temperature and decreasing strain rate. At lower deformation temperatures, continuous dynamic recrystallization is the main mechanism of DRX. However, discontinuous dynamic recrystallization becomes the predominant operating mechanism of DRX at high deformation temperature. The effects of friction and deformation heating on flow stress were analyzed and corrected. The results show that deformation heating has a significant influence on the flow stress at higher strain rates and lower temperatures, while the frictional effect is slight. Based on the experimental results, a strain-compensated Arrhenius-type equation was developed. Comparison of the experimental data with the calculated flow stress indicates that the developed constitutive equations can adequately describe the hot deformation behavior of the experimental alloy.

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張利斌,劉光明,韓廷狀,黃聞戰(zhàn),王榮軍,馬立峰.鑄態(tài)Mg-3Sn-1Mn-1La鎂合金組織演變及本構(gòu)方程建立[J].稀有金屬材料與工程,2021,50(3):835~847.[Zhang Libin, Liu Guangming, Han Tingzhuang, Huang Wenzhan, Wang Rongjun, Ma Lifeng. Libin Zhang1, 3, Guangming Liu1, 3*, Tingzhuang Han1, 3, Wenzhan Huang1, Rongjun Wang2, 3, Lifeng Ma2, 3[J]. Rare Metal Materials and Engineering,2021,50(3):835~847.]
DOI：10.12442/j. issn.1002-185X. E20200011

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  • 收稿日期:2020-03-22
  • 最后修改日期:2020-05-22
  • 錄用日期:2020-06-09
  • 在線發(fā)布日期: 2021-04-02
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