復合能場鑄軋對AZ61鎂板組織及性能的影響Effect of compound energy field cast-rolling on microstructure and properties of AZ61 magnesium alloy plate

采用金相顯微鏡、掃描電鏡、拉伸及彎曲性能測試等分析手段，研究復合能場(超聲波和電磁場)鑄軋工藝對AZ61鎂合金板微觀組織、力學性能和加工性能的影響。結果表明：與常規鑄軋鎂合金板帶相比，復合能場可有效減小晶粒尺寸，并使析出相均勻彌散分布；施加復合能場之后，鑄軋板抗拉強度、屈服強度及伸長率較常規鑄軋板分別提高10.58%、12.84%和52.17%，而終軋成品板分別提高10.45%、20.56%和65.25%，且板材軋制后具有裂紋傾向小、抗彎強度及最大撓度大、彎曲抗力小等性質，可有效減少加工過程中材料及工具磨損，獲得較好的綜合性能。

The influence of compound energy field (ultrasonic and electromagnetic field) cast-rolling process on the microstructure, mechanical and processing properties of AZ61 magnesium alloy plate was investigated by metallurgical microscopy, scanning electron microscopy, tensile and bending tests. The results show that the compound energy field effectively decreases the grain size and the precipitates distribute homogeneously compared with the conventional cast-rolling magnesium alloy strip. After adding the compound energy field, the tensile strength, the yield strength and elongation of the alloy plate increase by 10.58%, 12.84% and 52.17%, respectively, accompanied with the final rolling plate increasing by 10.45%, 20.56% and 65.25%. Furthermore, after cast-rolling, the alloy plate shows the characteristics of a weaker crack tendency, higher tensile strength and the maximum deflection, a lower bending resistance, etc, which reduces the abrasion between the material and tool during processing, and is also good to omnibus properties.

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