2Cu的形態(tài)從骨骼狀變?yōu)槠瑢訝睿诠簿l2Cu附近的α-Al的形態(tài)呈蜂窩狀。當(dāng)冷卻速率由2 K/s增加到100 K/s時(shí)，Al-6%Cu合金的硬度由618 MPa增加到726 MPa。"/>

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冷卻速率對(duì)Al-Cu二元合金凝固組織和性能的影響
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作者單位:

1.東北大學(xué) 材料電磁過(guò)程研究教育部重點(diǎn)實(shí)驗(yàn)室，遼寧 沈陽(yáng) 110819;2.東北大學(xué) 材料先進(jìn)制備技術(shù)教育部工程研究中心，遼寧 沈陽(yáng) 110819

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基金項(xiàng)目:

the Fundamental Research Funds for the National Natural Science Foundation of China (U1708251); the Key Research and Development Program of Liaoning (2020JH2/10700003); Liaoning Revitalization Talents Program, China (XLYC1807027); the Fundamental Research Funds for the Central Universities (No. N2109004)


Effect of Cooling Rate on Solidification Microstructure and Properties of Al-Cu Binary Alloy
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Affiliation:

1.Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China;2.Advanced Manufacturing Technology and Engineering Research Centers, Northeastern University, Shenyang 110819, China

Fund Project:

Fundamental Research Funds for the National Natural Science Foundation of China (U1708251); Key Research and Development Program of Liaoning (2020JH2/10700003); Liaoning Revitalization Talents Program, China (XLYC1807027); Fundamental Research Funds for the Central Universities (N2109004)

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    摘要:

    為了研究冷卻速率對(duì)Al-Cu二元合金凝固組織和性能的影響，通過(guò)楔形銅模鑄造制備了Al-6%Cu合金鑄錠。結(jié)果表明，當(dāng)冷卻速率從100 K/s降低到2 K/s時(shí)，鑄錠晶粒形態(tài)的轉(zhuǎn)變過(guò)程為：全部柱狀晶→柱狀晶與等軸晶混合→全部等軸晶。同時(shí)，靠近模壁處的柱狀晶寬度從244.7 μm增加到408.2 μm，鑄錠心部等軸晶的平均晶粒尺寸從629.8 μm減小到152.8 μm，并且平均枝晶臂間距從10.1 μm增加到52.8 μm。計(jì)算得出Al-6%Cu合金平均枝晶臂間距和冷卻速率經(jīng)驗(yàn)公式中的參數(shù)，其中A和n的值分別為78.75和0.41。當(dāng)冷卻速率從100 K/s降低到25 K/s時(shí)，共晶Al2Cu的形態(tài)從骨骼狀變?yōu)槠瑢訝?，在共晶Al2Cu附近的α-Al的形態(tài)呈蜂窩狀。當(dāng)冷卻速率由2 K/s增加到100 K/s時(shí)，Al-6%Cu合金的硬度由618 MPa增加到726 MPa。

    Abstract:

    To investigate the influence of cooling rate on the solidification structure of Al-Cu binary alloy, the ingot of Al-6%Cu alloy was produced by the wedge-shaped copper mode casting. The results indicate that when the cooling rate decreases from 100 K/s to 2 K/s, the grain morphology transformation of ingot is as follows: columnar grains→mixing of columnar grains with equiaxed grains→equiaxed grains. Meanwhile, the width of columnar crystal at the ingot edge increases from 244.7 μm to 408.2 μm, the average grain size of equiaxed crystal at the ingot core decreases from 629.8 μm to 152.8 μm, and the average dendrite arm spacing increases from 10.1 μm to 52.8 μm. The parameters A and n of Al-6%Cu alloy in the empirical formula of average dendrite arm spacing and cooling rate are 78.75 and 0.41, respectively. When the cooling rate decreases from 100 K/s to 25 K/s, the morphology of eutectic Al2Cu changes from skeletal to lamellar, and α-Al near the eutectic Al2Cu is cellular. With the cooling rate increases from 2 K/s to 100 K/s, the hardness of Al-6%Cu alloy is increased from 618 MPa to 726 MPa.

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王向杰,楊凌飛,譚宏娟,于芳,崔建忠.冷卻速率對(duì)Al-Cu二元合金凝固組織和性能的影響[J].稀有金屬材料與工程,2022,51(6):2033~2038.[Wang Xiangjie, Yang Lingfei, Tan Hongjuan, Yu Fang, Cui Jianzhong. Effect of Cooling Rate on Solidification Microstructure and Properties of Al-Cu Binary Alloy[J]. Rare Metal Materials and Engineering,2022,51(6):2033~2038.]
DOI：10.12442/j. issn.1002-185X.20210395

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歷史
  • 收稿日期:2021-05-05
  • 最后修改日期:2021-07-08
  • 錄用日期:2021-08-05
  • 在線發(fā)布日期: 2022-06-29
  • 出版日期: 2022-06-29