L=310K/cm,生長速率V=6～150μm/s的實驗條件下, NiAl-43V的凝固組織均為初生V枝晶+共晶組織(NiAl片層+V片層)。斷裂韌性測試表明NiAl-43V過共晶合金最大室溫斷裂韌性相比NiAl合金提高了四倍。隨著生長速率的增大室溫斷裂韌性從6μm/s的22.679 MPa.m1/2逐漸下降到150μm/s的18.422 MPa.m1/2。這是因為生長速率增大產(chǎn)生的細(xì)晶強化效應(yīng)弱于初生V枝晶和胞間區(qū)域的增加對斷裂韌性產(chǎn)生的不良影響。合金的斷口形貌分析表明合金斷裂為準(zhǔn)解理斷裂,在裂紋擴展中裂紋鈍化、裂紋再形核、裂紋偏轉(zhuǎn)、界面剝離、裂紋橋接和微裂紋鍵合韌化機制對提高NiAl-43V合金的室溫斷裂韌性做出了貢獻(xiàn)。初生V枝晶的析出一定程度降低了合金的斷裂韌性。"/>

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生長速率對定向凝固NiAl-43V過共晶合金組織演變和室溫斷裂韌性的影響
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1.內(nèi)蒙古科技大學(xué)材料與冶金學(xué)院;2.內(nèi)蒙古新金屬材料重點實驗室

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國家自然科學(xué)基金項目(No.51564041)；內(nèi)蒙古自然科學(xué)基金項目(No.2018MS05028)；


Effect of growth rates on microstructure evolution and room temperature fracture toughness of directionally solidi?ed NiAl-43V hypereutectic alloy
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    本文采用高溫度梯度液態(tài)金屬冷卻技術(shù)(LMC)制備了Ni-28.5Al-43V(at%)過共晶合金,利用光學(xué)顯微鏡(OM)、掃描電鏡(SEM)和三點彎曲(3PB)測試對合金的組織演變和斷裂韌性進(jìn)行了研究。在溫度梯度GL=310K/cm,生長速率V=6～150μm/s的實驗條件下, NiAl-43V的凝固組織均為初生V枝晶+共晶組織(NiAl片層+V片層)。斷裂韌性測試表明NiAl-43V過共晶合金最大室溫斷裂韌性相比NiAl合金提高了四倍。隨著生長速率的增大室溫斷裂韌性從6μm/s的22.679 MPa.m1/2逐漸下降到150μm/s的18.422 MPa.m1/2。這是因為生長速率增大產(chǎn)生的細(xì)晶強化效應(yīng)弱于初生V枝晶和胞間區(qū)域的增加對斷裂韌性產(chǎn)生的不良影響。合金的斷口形貌分析表明合金斷裂為準(zhǔn)解理斷裂,在裂紋擴展中裂紋鈍化、裂紋再形核、裂紋偏轉(zhuǎn)、界面剝離、裂紋橋接和微裂紋鍵合韌化機制對提高NiAl-43V合金的室溫斷裂韌性做出了貢獻(xiàn)。初生V枝晶的析出一定程度降低了合金的斷裂韌性。

    Abstract:

    In this paper, a Ni-28.5Al-43V (at%) hypereutectic alloy was prepared by liquid metal cooling technology (LMC), The microstructure evolution and mechanical properties of the alloy were investigated by optical microscopy (OM), scanning electron microscopy (SEM) and three-point bending (3PB) test. Under the experimental conditions(Temperature gradient GL=310K/cm, Growth rate V=6～150μm/s), the results show that the steady-state growth microstructure of NiAl-43V is composed of primary V dendrites and eutectic structure (NiAl lamellar +V lamellar). 3PB test shows that the maximum room temperature fracture toughness(RTFT) of NiAl-43V hypereutectic alloy is four times higher than that of NiAl alloy.The RTFT decreases from 22.679 MPa.m 1/2 at 6 μm/s to 18.422 MPa.m 1/2 at 150 μm/s as the growth rate increases.The reason is that the fine-grained strengthening effect caused by the increase of growth rate is weaker than the adverse effect of increased primary V dendrites and inter-cell regions on fracture toughness. Fracture morphology analysis of alloys indicates that alloy fracture is quasi-cleavage fracture.Crack blunting, crack renucleation, crack deflection, interfacial debonding, crack bridging and linkage of microcrack toughening mechanism contribute to the improvement of room temperature fracture toughness of NiAl-43V alloy in crack propagation. The precipitation of primary V dendrites reduces the fracture toughness of the alloy.

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徐鵬飛,張建飛,陳林,金自力,任慧平.生長速率對定向凝固NiAl-43V過共晶合金組織演變和室溫斷裂韌性的影響[J].稀有金屬材料與工程,2020,49(4):1415~1421.[Xu Pengfei, Zhang jianfei, Chen lin, Jin zili, Ren huiping. Effect of growth rates on microstructure evolution and room temperature fracture toughness of directionally solidi?ed NiAl-43V hypereutectic alloy[J]. Rare Metal Materials and Engineering,2020,49(4):1415~1421.]
DOI：10.12442/j. issn.1002-185X.20181286

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  • 收稿日期:2018-12-24
  • 最后修改日期:2019-02-27
  • 錄用日期:2019-04-10
  • 在線發(fā)布日期: 2020-05-07
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