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Ti-xCr-yCu鈦基材料的制備及組織性能研究
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國(guó)家自然科學(xué)基金項(xiàng)目(51271021);; 北京自然科學(xué)基金項(xiàng)目(2162025)


Preparation,Microstructure and Mechanical Properties of Ti-xCr-yCu Titanium Based Materials
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    摘要:

    通過(guò)粉末冶金法制備了Ti-xCr、Ti-yCu及Ti-xCr-yCu鈦基材料,研究了Cr、Cu含量對(duì)其相組成、顯微組織、壓縮屈服強(qiáng)度、彈性模量以及切削加工性能的影響規(guī)律。結(jié)果表明:隨Cr含量的增加,Ti-xCr鈦基材料依次出現(xiàn)了Ti4Cr、TiCr2及Cr相,其壓縮屈服強(qiáng)度表現(xiàn)出先增大后減小的趨勢(shì),當(dāng)Cr含量為10%時(shí)其屈服強(qiáng)度達(dá)到最大值(710 MPa),同時(shí),添加Cr元素有利于降低鈦基材料的彈性模量,最低可達(dá)25 GPa。添加Cu元素的鈦基材料,隨Cu含量的增加,Ti2Cu相增加,并且顯微組織細(xì)化,屈服強(qiáng)度降低;彈性模量受Cu含量影響較小而受燒結(jié)溫度影響較大。添加Cr和Cu元素的鈦基材料,其顯微組織主要為網(wǎng)籃組織,彈性模量低于純鈦,其中添加Cu元素有利于細(xì)化層片,添加Cr元素有利于細(xì)化等軸組織。此外,Cr含量為5%時(shí),鈦基材料具有較佳的切削加工性能。

    Abstract:

    The Ti-xCr,Ti-yCu and Ti-xCr-yCu titanium based materials were prepared by powder metallurgy using the blended elemental technique. The effects of Cr and Cu additions on phase composition,microstructure,compressive yield strength and elastic modulus were investigated. The results show that with the increase of Cr content,Ti_4Cr,TiCr_2 and Cr phases appeared successively in Ti-x Cr alloys,and the compressive yield strength increases firstly and then decreases. The highest compressive yield strength is 710 MPa when x = 10. In the meantime,the elastic modulus of Ti-xCr alloys decreases and the lowest value is 25 GPa. In Ti-yCu alloys,the precipitated phase( Ti_2Cu) increases,the microstructure gets fine,and the yield strength decreases with the increasing of Cu content. The elastic modulus is less affected by the Cu content and is more affected by the sintering temperature. The microstructure of the titanium based materials containing Cr and Cu,in which Cu is favorable for layer refinement and Cr is favorable for equiaxed microstructure refinement,are mainly basketweave structure,and their elastic moduli are lower than that of pure titanium. The results also show that the machinability of Ti-5 Cr titanium material is better.

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. Ti-xCr-yCu鈦基材料的制備及組織性能研究[J].鈦工業(yè)進(jìn)展,2019,36(1):1-7.

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  • 在線發(fā)布日期: 2019-06-03
  • 出版日期: 2019-02-25