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高強(qiáng)度Cu-Ni-(Al)-Si合金的組織和性能
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國(guó)家自然科學(xué)基金 (51271203)；國(guó)家科技支撐計(jì)劃（2014BAC03B05）；湖南有色基金 (YSZN2013CL06)


Microstructure and Properties of Superhigh Strength Cu-Ni-(Al)-Si Alloy
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    摘要:

    通過(guò)光學(xué)顯微鏡、維氏硬度計(jì)、雙臂電橋、掃描電子顯微鏡、透射電子顯微鏡等測(cè)試手段對(duì)Cu-5.2Ni-1.2Si和Cu-5.2Ni-1.5Al-1.2Si合金的組織結(jié)構(gòu)和性能進(jìn)行了表征與測(cè)試。結(jié)果表明：2種合金的鑄態(tài)組織均為發(fā)達(dá)的樹(shù)枝晶組織，包括白亮的枝晶區(qū)、非平衡凝固相粒子及中間過(guò)渡區(qū)。其中枝晶為富Cu區(qū)，凝固相為富Ni和Si區(qū)，Al元素則比較均勻地分布在鑄態(tài)組織中。峰值時(shí)效后，Cu-5.2Ni-1.5Al-1.2Si合金具有比Cu-5.2Ni-1.2Si合金更高的硬度。Al元素不但促進(jìn)了Ni2Si的沉淀析出，還形成了Ni3Al沉淀相，從而大大提高合金強(qiáng)度。2種合金的時(shí)效早期均出現(xiàn)了有序化，峰時(shí)效時(shí)主要為沉淀析出強(qiáng)化，合金具有較好的抗過(guò)時(shí)效能力

    Abstract:

    Microstructure and properties of the Cu-5.2Ni-1.2Si and Cu-5.2Ni-1.5Al-1.2Si alloy were studied by optical microscope, Vickers hardness tester, two-arm electricity bridge, scanning electron microscope and transmission electron microscope. Results show that the developed dendrite appears in the casting ingot, which can be divided into dendrite area, non-equilibrium precipitates and the middle transition region. The dendrite area is rich in Cu element, the precipitates are rich in Ni and Si elements, and the Al element is distributed in the ingot evenly. After the appropriate thermo-mechanical treatment, the hardness of Cu-5.2Ni-1.5Al-1.2Si alloy is higher than that of Cu-5.2Ni-1.2Si alloy, and Ni2Si precipitates contribute to the main strength. Al element promotes the Ni2Si precipitation process. A new phase of Ni3Al is formed, which also improves the strength of the alloy effectively. Ordering transformation appears in the early state of ageing treatment, and the high strength is attributed to the precipitation particles. The designed alloy exhibits good anti-over aged capability

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黎三華,李 周,雷 前,汪明樸,申鐳諾,潘志勇,劉會(huì)群.高強(qiáng)度Cu-Ni-(Al)-Si合金的組織和性能[J].稀有金屬材料與工程,2015,44(6):1427~1431.[Li Sanhua, Li Zhou, Lei Qian, Wang Mingpu, Shen Leinuo, Pan Zhiyong, Liu Huiqun. Microstructure and Properties of Superhigh Strength Cu-Ni-(Al)-Si Alloy[J]. Rare Metal Materials and Engineering,2015,44(6):1427~1431.]
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  • 收稿日期:2014-06-14
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  • 在線發(fā)布日期: 2016-01-04
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