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Mo-Si-B三元系中T2相合金制備及其室溫力學(xué)性能
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國(guó)家自然科學(xué)基金面上項(xiàng)目 (50871012)；國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃 (2011CB605502)


Preparation and Room Temperature Mechanical Properties of T2 Alloy in the Mo-Si-B System
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    摘要:

    通過(guò)放電等離子燒結(jié)(SPS)制備T2(Mo5SiB2)相合金，并采用SEM、XRD及壓痕、壓縮和三點(diǎn)彎曲等實(shí)驗(yàn)對(duì)合金的微觀組織和室溫力學(xué)性能進(jìn)行表征。結(jié)果表明：SPS法以獨(dú)特的等離子活化燒結(jié)方式制備出純度高、致密且晶粒細(xì)小的 T2相合金。該合金在室溫壓縮下幾乎沒有塑性變形，抗壓強(qiáng)度為2907 MPa；維氏硬度為17.86 GPa，壓痕法測(cè)得的斷裂韌性為3.23 MPa·m1/2，與三點(diǎn)彎曲法測(cè)得的3.34 MPa·m1/2接近，沿{001}面發(fā)生解理斷裂。共價(jià)鍵交替排列，是T2相室溫脆性、高強(qiáng)度、高硬度的根本原因

    Abstract:

    The intermetallic T2 (Mo5SiB8) alloy was prepared by sparking plasma sintering (SPS). The microstructure and room temperature mechanical properties were characterized by SEM, XRD as well as indentation, compression and notched three-point bending tests. The results show that SPS, a unique plasma activation sintering approach, favors the formation of pure T2 alloy with a dense and fine-grained microstructure. Almost no plastic deformation is observed in the true strain-stress curve of the T2 alloy after room temperature compression and the alloy has a compressive strength of 2907 MPa. The Vickers hardness is 17.86 GPa, while the averaged fracture toughness determined from indentation crack lengths is 3.23 MPa·m1/2, similar to the averaged value of 3.34 MPa·m1/2 from single edge notch bend specimens. The cleavage fracture occurs across {001} planes of the T2 alloy in the three-point bending tests at room temperature. For the T2 alloy, the contribution to room temperature brittleness, high strength and high hardness is mainly derived from the covalent bonds which arrange alternately in the T2 phase

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潘昆明,張來(lái)啟,王 玨,杜 偉,林均品. Mo-Si-B三元系中T2相合金制備及其室溫力學(xué)性能[J].稀有金屬材料與工程,2013,42(5):1080~1084.[Pan Kunming, Zhang Laiqi, Wang Jue, Du Wei, Lin Junpin. Preparation and Room Temperature Mechanical Properties of T2 Alloy in the Mo-Si-B System[J]. Rare Metal Materials and Engineering,2013,42(5):1080~1084.]
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  • 收稿日期:2012-06-01
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