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球磨時(shí)間和熱壓溫度對(duì)粉末冶金Nb-16Si-22Ti-2Al-2Hf-2Cr合金顯微組織和室溫力學(xué)性能的影響
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國家自然科學(xué)基金（51071009）；航空基金（2010ZF51071）


Effects of Ball Milling Time and Sintering Temperature on Microstructure and Room-Temperature Mechanical Properties of Nb-16Si-22Ti-2Al-2Hf-2Cr Alloy Synthesized by Powder Metallurgy
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    摘要:

    采用粉末冶金法制備了Nb-16Si-22Ti-2Al-2Hf-2Cr合金，研究了粉末球磨時(shí)間（5、10、20 h）及熱壓燒結(jié)溫度（1500、1600 ℃）對(duì)合金組織和室溫力學(xué)性能的影響。結(jié)果表明：熱壓燒結(jié)后的合金由Nb基固溶體NbSS、Ti基固溶體TiSS和硅化物Nb5Si3三相組成。隨著球磨時(shí)間的延長，Nb5Si3和TiSS的含量增加，而NbSS的含量減少。室溫硬度隨球磨時(shí)間延長和熱壓燒結(jié)溫度的升高而提高，20 h/1600 ℃熱壓燒結(jié)合金硬度值最高，HV硬度達(dá)到11500 MPa。1500和1600 ℃熱壓燒結(jié)下合金的斷裂韌性隨著粉末球磨時(shí)間的延長均呈下降的趨勢，5 h/1500 ℃熱壓燒結(jié)合金斷裂韌性值最高，為10.14 MPa·m1/2。

    Abstract:

    Nb-16Si-22Ti-2Al-2Hf-2Cr bulk alloys have been prepared by powder metallurgy. The effects of milling time (5, 10, 20 h) of powder mixtures and hot-pressing temperatures (1500, 1600 °C) on the microstructure and room-temperature mechanical properties of the bulk alloys were investigated. It is revealed that the hot-pressed alloys are mainly composed of 3 phases including Nb solid solution (NbSS), Ti solid solution (TiSS) and Nb5Si3 silicides. With prolonging the milling time, the volume fractions of Nb5Si3 and TiSS phases increase, but that of NbSS phases decreases. The improvement in room-temperature hardness of bulk alloys is achieved with milling time and hot-pressing temperature increasing, and the bulk alloy milled for 20 h and hot-pressed at 1600 °C has the highest hardness of 11500 MPa. Moreover, the fracture toughness of the alloys hot-pressed at 1500 °C and 1600 °C both decreased with milling time prolonging. The bulk alloy milled for 5 h and hot-pressed at 1500 °C has the highest fracture toughness of 10.14 MPa·m1/2.

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符永明,劉 偉,宗 偉,沙江波.球磨時(shí)間和熱壓溫度對(duì)粉末冶金Nb-16Si-22Ti-2Al-2Hf-2Cr合金顯微組織和室溫力學(xué)性能的影響[J].稀有金屬材料與工程,2013,42(2):400~404.[Fu Yongming, Liu Wei, Zong Wei, Sha Jiangbo. Effects of Ball Milling Time and Sintering Temperature on Microstructure and Room-Temperature Mechanical Properties of Nb-16Si-22Ti-2Al-2Hf-2Cr Alloy Synthesized by Powder Metallurgy[J]. Rare Metal Materials and Engineering,2013,42(2):400~404.]
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