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AZ41镁合金超塑性成形特性

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研究AZ41镁合金在热轧(无后续热变形)条件下的显微组织变化,以确定其在超塑性成形工艺中的适用性,并确定最佳成形参数.采用高温拉伸试验和热气体胀形试验对材料在不同应变速率(1×10−1～1×10−3 s−1)和温度(350～450℃)下的成形性进行评估.利用GOM Aramis相机进行圆形网格分析,了解峰值应变和材料减薄与工业成形过程的关系.通过成形后EBSD和STEM分析材料成形性的机制,发现存在明显动态再结晶.最佳成形参数为450℃ 和1×10−3 s−1,此时的峰值伸长率达520％.在1×10−2 s−1下,450℃和400℃时的工业相关伸长率分别为195％和170％.
Superplastic forming characteristics of AZ41 magnesium alloy
An AZ41 magnesium alloy in the hot-rolled condition without further thermomechanical processing to modify its microstructure was investigated to establish its suitability for use within a superplastic forming process and to establish optimum forming parameters. Formability was assessed using elevated temperature tensile testing and hot gas bulging, across a range of strain rates (1×10−1−1×10−3 s−1) and temperatures (350−450℃). Circle grid analysis with GOM Aramis cameras was used to understand peak strains and material thinning in relation to industrial forming processes. Post forming EBSD and STEM analysis was conducted to understand the mechanisms responsible for the materials formability, with dynamic recrystallization being clearly evident. Peak elongation of 520％ was achieved at 450℃ and 1×10−3 s−1; industrially relevant elongation was achieved at 1×10−2 s−1 at both 450℃ (195％) and 400℃ (170％).

magnesiumsuperplastic formingsuperplasticityelectron back-scattered diffraction (EBSD)AZ41 magnesium alloy

S.TAYLOR、G.D.WEST、E.MOGIRE、F.TANG、H.R.KOTADIA

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WMG the University of Warwick,Coventry CV47AL,UK

Buehler,WMG Materials Engineering Centre,the University of Warwick,Coventry CV47AL,UK

镁 超塑性成形 超塑性 电子背散射衍射(EBSD) AZ41镁合金

authors would like to thank the WMG High Value Manufacturing Catapult Centre for funding this work.In addition,the character

2021

10.1016/S1003-6326(21)65526-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(3)
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