【摘要】：本文以ZCuSn10Zn2合金為基體合金,通過(guò)添加Fe、Co元素,利用離心鑄造技術(shù)制備出原位納米顆粒增強(qiáng)ZCuSn10Zn2Fe1.5Co1合金,借助于EDS能譜分析、透射電鏡分析等檢測(cè)手段確定了增強(qiáng)相納米顆粒為Fe顆粒,顆粒尺寸分布在2-20nm之間,并與Cu基體保持著共格關(guān)系,新型合金組織從原合金粗大的樹枝晶轉(zhuǎn)變?yōu)榫Я３叽缭?0-60μm之間的等軸晶,納米鐵顆粒均勻彌散的鑲嵌在ZCuSn10Zn2Fe1.5Co1合金的等軸晶粒中,此外合金中Sn元素的偏析現(xiàn)象也得到了減輕。與ZCuSn10Zn2合金相比,ZCuSn10Zn2Fe1.5Co1合金的抗拉強(qiáng)度由原來(lái)的225MPa提高到419.75MPa,合金的伸長(zhǎng)率保持在15.68%,材料的延塑性得到了很好地保持。 通過(guò)一系列的固溶、時(shí)效工藝,研究了合金力學(xué)性能的變化規(guī)律。合金經(jīng)過(guò)700℃固溶兩小時(shí)后,抗拉強(qiáng)度和斷后伸長(zhǎng)率分別達(dá)到了485.8MPa、51.84%,較鑄態(tài)合金提高了15.74%、230.62%,再經(jīng)過(guò)400℃時(shí)效四小時(shí)后,合金的抗拉強(qiáng)度達(dá)到了522.37MPa,相比較鑄態(tài)合金的419.75MPa提高了24.5%,斷后伸長(zhǎng)率為46.56%,相比較鑄態(tài)合金的15.68%提高了196.94%。 借助于SEM、TEM、HRTEM、小角X射線散射(SAXS)技術(shù)、原位拉伸實(shí)驗(yàn)研究了納米顆粒增強(qiáng)鑄造銅合金的強(qiáng)化機(jī)理和納米顆粒在合金鑄態(tài)和時(shí)效態(tài)的演變,結(jié)果表明鑄態(tài)合金和時(shí)效合金中都分布有大量與基體保持共格或半共格的納米顆粒。彌散分布的納米顆粒、晶粒的顯著細(xì)化及硬脆第二相的減少是合金綜合力學(xué)性能大幅提高的主要原因。 分析了納米顆粒在銅合金基體晶粒中均勻分布的原因,發(fā)現(xiàn)凝固過(guò)程中傳統(tǒng)的微米級(jí)顆粒與固液界面的交互作用模型并不適用于原位納米顆粒增強(qiáng)銅合金中納米鐵顆粒與固液界面的交互作用,指出凝固過(guò)程中納米顆粒在合金液中做無(wú)規(guī)則的布朗運(yùn)動(dòng)是納米顆粒最終進(jìn)入合金基體晶粒的關(guān)鍵。 把原位納米顆粒增強(qiáng)技術(shù)與精密鑄造技術(shù)相結(jié)合,采用離心鑄造制備出長(zhǎng)期耐壓指標(biāo)達(dá)4.5MPa、短期耐壓指標(biāo)達(dá)6.0MPa的ZCuSn10Zn2Fe1.5Co1泵體。
[Abstract]:In this paper, the in-situ nano-particle reinforced ZCuSn10Zn2Fe1.5Co1 alloy was prepared by centrifugal casting with ZCuSn10Zn2 alloy as base alloy and Fe,Co element added. The results were analyzed by EDS spectroscopy. Transmission electron microscopy (TEM) analysis and other testing methods confirmed that the reinforced phase nanoparticles were Fe particles, the particle size was distributed between 2-20nm and the Cu matrix, and maintained a coherent relationship with the matrix. The new alloy structure changed from coarse dendrite to equiaxed crystal with grain size of 20-60 渭 m. The nano-iron particles were uniformly dispersed in the equiaxed grains of ZCuSn10Zn2Fe1.5Co1 alloy, and the segregation of Sn elements in the alloy was also reduced. Compared with the ZCuSn10Zn2 alloy, the tensile strength of ZCuSn10Zn2Fe1.5Co1 alloy was increased from the original 225MPa to 419.75MPa, the elongation of the alloy was kept at 15.68 and the ductility of the alloy was kept well. The mechanical properties of the alloy were studied by a series of solid solution and aging processes. After two hours of solution at 700 鈩，

本文編號(hào)：2203564