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大晶粒單相Ni-50Al金屬間化合物高溫塑性
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國(guó)家自然科學(xué)基金（59895150）


Plasticity in Large-Grained Single-Phase Ni-50Al Intermetallics at High Temperature
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    摘要:

    研究了原始晶粒尺寸為220 mm的正化學(xué)計(jì)量比單相Ni-50Al金屬間化合物的高溫變形行為及組織演變規(guī)律。結(jié)果表明，該合金在溫度1000~1100 ℃，應(yīng)變速率7.5×10-4~1×10-3 s-1范圍內(nèi)具有良好的高溫塑性變形能力；在1075 ℃，應(yīng)變速率為8.75×10-4 s-1時(shí)，最大延伸率可達(dá)139%。金相顯微分析表明，原始大晶粒組織經(jīng)高溫塑性變形后顯著細(xì)化；EBSD與 TEM分析表明，變形過程中小角度晶界持續(xù)產(chǎn)生，較小角度晶界向較大角度晶界不斷演變，最終導(dǎo)致晶粒顯著細(xì)化。顯微結(jié)構(gòu)綜合分析表明，大晶粒Ni-50Al合金的高溫塑性變形是由位錯(cuò)的交滑移與攀移等交互作用產(chǎn)生的連續(xù)動(dòng)態(tài)回復(fù)和再結(jié)晶導(dǎo)致的。

    Abstract:

    High temperature deformation behavior and microstructure evolution of stoichiometry single phase Ni-50Al intermetallics with an initial grain size of 220 mm was investigated. Results show that the alloy exhibits good plastic behavior under initial strain rate from 7.5×10-4 to 1×10-3 s-1 in the temperature range of 1000-1100 ℃. A maximum elongation of 139% was obtained under initial strain rate of 8.75×10-4 s-1 at 1075℃. Optical metallography (OM) shows that the grains were refined during plastic deformation from initial 220 μm to less than 30 μm. Electron back-scattered diffraction（EBSD）and transmission electron microscopy (TEM) observations show that small-angle boundaries formed continuously during deformation, and changed to large-angle boundaries, resulting in finer grains finally. Microstructure analyses reveal that high-temperature plastic deformation could be attributed to continuously dynamic recovery and recrystallization (CDRR), which was caused by the interaction among gliding and climbing of dislocation.

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胡 靜,林棟樑.大晶粒單相Ni-50Al金屬間化合物高溫塑性[J].稀有金屬材料與工程,2009,38(12):2121~2125.[Hu Jing, Lin Dongliang. Plasticity in Large-Grained Single-Phase Ni-50Al Intermetallics at High Temperature[J]. Rare Metal Materials and Engineering,2009,38(12):2121~2125.]
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  • 收稿日期:2008-11-23
  • 最后修改日期:2009-09-11
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