Texture and room-temperature formability of rolled Mg-1.5Zn-xCe alloys
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摘要: 實驗研究了不同Ce元素含量對變形Mg-1.5Zn合金的織構及室溫成形性能的影響.結果表明:在相同的熱軋和退火工藝處理后,添加不同含量的Ce元素均可以有效弱化鎂合金織構強度.Mg-1.5Zn合金中添加質量分數為0.2%的Ce元素后表現出了優異的室溫成形性能,織構強度最大值僅為2.20,織構沿著橫向分裂,并且基面法向即c軸沿著橫向發生約為±35°偏轉,室溫下軋向方向延伸率達到23.2%,埃里克森杯突值為5.46,平面各項異性系數Δr=0.01;然而,Mg-1.5Zn合金中添加質量分數分別為0.5%和0.9%的Ce元素后,織構強度增加,埃里克森杯突值減小,由于在合金中生成了粗大的第二相粒子,使得Mg-1.5Zn-xCe合金的室溫成形性能變低.Abstract: The texture and room-temperature formability of rolled Mg-1.5Zn alloys containing different contents of Ce were inves-tigated by experiment, it is indicated that during the same hot rolling and annealing processes, Ce addition can effectively modify and weaken the texture. When 0.2wt% Ce is added, the Mg-1.5Zn alloy has excellent room-temperature formability, and its maximum texture intensity is only 2.20. This alloy exhibits the transverse direction split texture, whose basal pole is tilted by about ±35° from the normal direction toward the transverse direction. At room temperature, the Erichsen value reaches 5.46, and the ultimate elonga-tion in the rolling direction is 23.2% with a low planar anisotropy value of 0.01. However, 0.5% and 0.9% Ce additions promote the formation of huge secondary phase particles, resulting in an increase in the intensity of the basal texture, a decrease in the Erichsen value, and deterioration in the room-temperature stretch formability.
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Key words:
- magnesium alloys /
- rare earth addition /
- cerium /
- texture /
- formability
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