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Al-Zn-Ni-Mg-Cu變形鋁合金的共晶強化效應(yīng)
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1.西北工業(yè)大學 凝固技術(shù)國家重點實驗室,陜西 西安;2.中國兵器科學研究院寧波分院 寧波

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寧波市自然科學基金資助(項目號2017A610040)


EUTECTIC STRENTHENING EFFECT OF AL-ZN-NI-MG-CU ALUMINUM ALLOY
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1.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an;2.The Ningbo Branch of Ordnance Science Institute of China

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    摘要:

    在Al-Zn-Mg-Cu變形鋁合金中加入3%~5%的Ni元素，通過共晶反應(yīng)形成了大量的Al3Ni相，除MgZn2相時效強化以外還增加了Al3Ni相的彌散強化作用。Ni含量的增加既改善了Al-Zn-Mg-Cu變形鋁合金的鑄造性能和可焊性，又提高了抗拉強度和屈服強度。Al-Zn-Ni-Mg-Cu鋁合金較佳的成分為Al-5.6Zn-3.5Ni-2Mg-1Cu，其抗拉強度、屈服強度和斷后伸長率分別為650MPa、572MPa和7.5%，焊接接頭的抗拉強度和斷后伸長率分別為323MPa、2%。隨著強度的增加，Al3Ni相由界面撕裂轉(zhuǎn)變?yōu)樽陨頂嗔?，Ni含量的增加提高了Al3Ni的強化效果，但不宜超過共晶點。降低Al3Ni相的長徑比能抑制Al3Ni相的自身斷裂，Al3Ni相的均勻分布能阻礙再結(jié)晶晶粒的異常長大。

    Abstract:

    3%~5% Ni element is added to the Al-Zn-Mg-Cu deformed aluminum alloy, and a large amount of Al3Ni phases are formed by eutectic reaction, the particle strengthening effect of the Al3Ni phases is added besides of MgZn2 aging strengthening. The increase of Ni content not only improves the casting performance and weldability of the Al-Zn-Mg-Cu deformed aluminum alloy, but also increases the tensile strength and yield strength. The preferred composition of Al-Zn-Ni-Mg-Cu aluminum alloy is Al-5.6Zn-3.5Ni-2Mg-1Cu. Its tensile strength, yield strength and elongation are 650MPa, 572MPa and 7.5%, respectively. The tensile strength and elongation of its welded joint were 323 MPa and 2%, respectively. With the increase of Zn content, the Al3Ni phase changes from interfacial tear to self-fracture. Increasing the content of Ni helps to increase the strengthening effect of Al3Ni phases, but the content of Ni cannot beyond the eutectic point.Decreasing the aspect ratio of Al3Ni particles helps to suppress the self-fracture of Al3Ni phases. Uniform distribution of Al3Ni phase helps to prevent the abnormal growing of recrystallized grains.

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陳大輝,陳錚,聶景江,洪曉露,劉永強,任麗宏,侯林沖. Al-Zn-Ni-Mg-Cu變形鋁合金的共晶強化效應(yīng)[J].稀有金屬材料與工程,2020,49(7):2319~2325.[CHEN Dahui, CHEN Zheng, NIE Jingjiang, HONG Xiaolu, LIU Yongqiang, REN Lihong, HOU Linchong. EUTECTIC STRENTHENING EFFECT OF AL-ZN-NI-MG-CU ALUMINUM ALLOY[J]. Rare Metal Materials and Engineering,2020,49(7):2319~2325.]
DOI：10.12442/j. issn.1002-185X.20190810

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  • 收稿日期:2019-10-03
  • 最后修改日期:2019-12-16
  • 錄用日期:2020-01-03
  • 在線發(fā)布日期: 2020-08-31
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