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AZ31鎂合金薄板經(jīng)不同累積應變的連續(xù)彎曲變形后的顯微組織與成形性能的變化
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1.Taiyuan University of Science and Technology;2.Chongqing University

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Evolution of microstructure and formability of AZ31 Mg alloy sheets processed by continuous bending with different accumulated strain
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1.Heavy Machinery Engineering Research Center of the Ministry of Education,Taiyuan University of Science and Technology;2.State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University;3.College of Materials Science and Engineering,Taiyuan University of Technology

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    摘要:

    本文對AZ31鎂合金板材進行不同累積應變的連續(xù)彎曲變形及退火處理，隨后對顯微組織與力學性能的變化進行了研究。結(jié)果表明：經(jīng)不同累積應變的連續(xù)彎曲變形后鎂合金板材的顯微組織中沒有發(fā)現(xiàn)孿晶,退火后，板材表層的晶粒異常長大，粗晶層的厚度隨著累積應變的增加而增加，并且使鎂合金板材的織構(gòu)朝RD方向偏轉(zhuǎn)，偏轉(zhuǎn)角度隨累積應變的增加而增大；與原始板材相比，連續(xù)彎曲變形及退火處理使鎂合金板材呈現(xiàn)出較好的室溫成形性能（杯突值由2.3mm提高到4.9mm，提高了~113%），這主要歸因于基面織構(gòu)的改善使鎂合金板材的r值減小與n值增大。

    Abstract:

    AZ31 alloy sheets were subjected to continuous bending (CB) process with various accumulated strain in a single pass at room temperature, and followed by annealing treatment. The corresponding microstructure and mechanical properties of as-received and CB sheets were investigated in the present paper. The obtained results indicated that no twins were observed in all microstructures during CB process. Abnormal grain growth occurred in the surface part after annealing and the depth of coarse-grained layer increased with the accumulated strain increasing. Moreover, the CB sheets in annealing condition exhibited a RD-tilt basal texture, and the inclination angle increased with the accumulated strain increasing. Compared to the as-received sample with a strong basal texture, the CB processed samples exhibited better stretch formability (2.3mm vs. 4.9mm, increased by ~113%), due to smaller r-value and larger n-value, which was related to the texture evolution.

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韓廷狀,黃光勝,王利飛,蔣斌,王冠剛,湯愛濤,潘復生. AZ31鎂合金薄板經(jīng)不同累積應變的連續(xù)彎曲變形后的顯微組織與成形性能的變化[J].稀有金屬材料與工程,2020,49(1):21~26.[Tingzhuang Han, Guangsheng Huang, Lifei Wang, Bin Jiang, Guangang Wang, Aitao Tang, Fusheng Pan. Evolution of microstructure and formability of AZ31 Mg alloy sheets processed by continuous bending with different accumulated strain[J]. Rare Metal Materials and Engineering,2020,49(1):21~26.]
DOI：10.12442/j. issn.1002-185X. E20180019

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  • 收稿日期:2018-07-11
  • 最后修改日期:2019-12-17
  • 錄用日期:2018-08-31
  • 在線發(fā)布日期: 2020-02-16
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