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Ti43Al5Nb0.03Y合金高溫?zé)釅嚎s行為及其組織演變
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哈爾濱市青年科技創(chuàng)新人才基金(2008RFQXG040)


Hot Compression and Microstructural Evolution of Ti43Al5Nb0.03Y Alloy
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    摘要:

    在熱模擬試驗(yàn)機(jī)上對(duì)Ti43Al5Nb0.03Y合金進(jìn)行壓縮變形實(shí)驗(yàn)，溫度范圍為1050~1200 ℃，應(yīng)變速率范圍為10-3~10-1 s-1，獲得了其真應(yīng)力-真應(yīng)變曲線，并對(duì)熱變形組織進(jìn)行顯微分析。結(jié)果表明：在低于1200 ℃的條件下，材料的鍛后組織為殘余層片和再結(jié)晶晶粒的混合組織，而溫度達(dá)到1200 ℃時(shí)，材料鍛后得到完全再結(jié)晶組織；在實(shí)驗(yàn)所涉及的溫度及應(yīng)變速率范圍內(nèi)，Ti43Al5Nb0.03Y合金的塑性變形機(jī)制主要為γ相中的滑移和孿生，其流變軟化機(jī)制主要為γ相動(dòng)態(tài)再結(jié)晶以及少量的γ相中的回復(fù)；該合

    Abstract:

    Thermo-mechanical processing parameters of Ti-43Al-5Nb-0.03Y (mole fraction, %) alloy are investigated by hot simulation tests at 1050~1250 ℃ on Gleeble-1500D with a nominal deformation of 50% and a strain rate of 10-1~10-3?s-1. The true strain–true stress curves have been obtained and the microstructures are observed. The results show that the microstructure consists of recrystallized grains and remained-lamellar when the compression temperature is lower than 1200 ℃, and of recrystallized grains at 1200 ℃. The major mechanism of plastic deformation is the slip deformation and twinning deformation, and the main softening mechanism is dynamic the recrystallization and dynamic recovery in the γ phase. The crack-free pancakes are obtained at a hot compressive temperature of 1200 ℃ and a strain rate of 10-3 s-1.

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張 浩,徐文臣,單德彬. Ti43Al5Nb0.03Y合金高溫?zé)釅嚎s行為及其組織演變[J].稀有金屬材料與工程,2009,38(8):1368~1372.[Zhang Hao, Xu Wenchen, Shan Debin. Hot Compression and Microstructural Evolution of Ti43Al5Nb0.03Y Alloy[J]. Rare Metal Materials and Engineering,2009,38(8):1368~1372.]
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  • 收稿日期:2008-10-30
  • 最后修改日期:2009-03-06
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