Effects of precipitates and texture on the anisotropy of high-strength Cu-Ni-Si alloy sheets
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摘要: 利用利用X射線衍射、電子背散射衍射和透射電子顯微鏡等手段研究了Cu-Ni-Si系合金在不同固溶溫度下第二相與織構對其平面各向異性的影響.結果表明:隨固溶溫度的升高,合金強度和伸長率均出現先升高后降低的趨勢,且存在明顯的各向異性;800℃固溶時,Cu'和S'為主織構,部分形變晶粒誘發少量Brass、Goss和{011}〈511〉取向的形成,使得合金各向異性減弱;高溫固溶時(≥ 850℃),晶粒發生完全再結晶,Cu'和S'織構強度顯著增加,Brass等織構減弱甚至消失,各向異性增強;850℃固溶時效后形成δ-Ni2Si析出相,并與基體滿足[001]Cu//[110]δ,(010)Cu//(001)δ位向關系,溫度進一步增加,第二相析出體積分數降低,有利于改善材料的各向異性.Abstract: The effects of texture and precipitates on the plane anisotropy of Cu-Ni-Si alloy under different solid-solution temperature conditions were investigated by X-ray diffraction, electron backscattered diffraction, and transmission electron microscopy. The results show that strength and elongation first increase and then decrease with increasing solid-solution temperature, exhibiting apparently anisotropy. After 800℃ solid solution, the Cu' and S' are mainly texture and the alloy has weak anisotropic properties, which correlates with the coexistence of Brass, Goss, and {011}〈511〉orientation owing to deformed grains. Complete recrystallization can be obtained at high temperature solution (≥ 850℃), the Cu' and S' texture intensity increases, whereas the Brass texture weakens and disappears and the anisotropy increases. δ-Ni2Si precipitation is observed after 850℃ solution and subsequent aging, and the crystal orientation between the matrix and precipitates is [001]Cu//[110]δ and (010)Cu//(001)δ. The fraction of nanosize precipitates decreases significantly with increasing temperature and this improves the anisotropy.
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Key words:
- copper-nickel-silicon /
- solid solution /
- texture /
- precipitates /
- anisotropy
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參考文獻
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