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納米壓痕法測(cè)量超細(xì)晶工業(yè)純鈦室溫蠕變速率敏感指數(shù)
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西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院,西安建筑科技大學(xué)冶金工程學(xué)院

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國(guó)家自然科學(xué)基金資助 (項(xiàng)目號(hào)51474170),陜西省教育廳專項(xiàng)項(xiàng)目(項(xiàng)目號(hào)14JK1390)


Measurement of Creep Rate Sensitivity of Ultra-fine Grained Commercial Purity Titanium at Room Temperature by Using Nanoindentation
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College of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an,College of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an,College of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an,College of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an

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    摘要:

    室溫下,采用復(fù)合細(xì)化(ECAP+冷軋+旋鍛)工藝,制備出平均晶粒尺寸約為180 nm的超細(xì)晶工業(yè)純鈦,其抗拉強(qiáng)度高達(dá)870 MPa。利用納米壓痕儀對(duì)超細(xì)晶工業(yè)純鈦以恒加載速率/載荷的方式進(jìn)行測(cè)試實(shí)驗(yàn),通過(guò)測(cè)定壓頭保載階段的壓入位移和材料的硬度值計(jì)算得出室溫蠕變速率敏感指數(shù)m值。結(jié)果表明：超細(xì)晶工業(yè)純鈦由于晶粒明顯細(xì)化,晶界數(shù)量增多,晶界長(zhǎng)度增加,位錯(cuò)增殖,在室溫下表現(xiàn)出優(yōu)良的抗蠕變能力,適合在壓力環(huán)境下長(zhǎng)期工作,其蠕變機(jī)理主要為蠕變位錯(cuò)機(jī)理。室溫蠕變速率敏感指數(shù)m值與加載條件無(wú)關(guān),主要由材料的微觀組織決定。

    Abstract:

    Ultra-fine grained commercial purity titanium (UFG CP Ti) was fabricated by combined refining process (Equal channel angular pressing (ECAP), cold rolling and rotary swaging) at room temperature. The grain average size of UFG CP Ti was about 180 nm, and ultimate tensile strength of UFG CP Ti was over 870 MPa. The nanoindention creep tests of UFG CP Ti were carried out by the nanoindenter with the constant loading rate/load at room temperature. The creep strain rate sensitivity m was determined by using depth and micro-hardness during the holding load stage. The results show that due to the obvious grain refinement, increase of the amount and the length of grain boundaries and the dislocation multiplication, UFG CP Ti shows good resistance to creep at room temperature and its major creep mechanism is the dislocation creep. The values of indentation creep rate sensivities are independent of loading conditions, but are close related to the microstructure of the materials.

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羅雷,趙西成,劉曉燕,楊西榮.納米壓痕法測(cè)量超細(xì)晶工業(yè)純鈦室溫蠕變速率敏感指數(shù)[J].稀有金屬材料與工程,2017,46(5):1365~1369.[Luo Lei, Zhao Xicheng, Liu Xiaoyan, Yang Xirong. Measurement of Creep Rate Sensitivity of Ultra-fine Grained Commercial Purity Titanium at Room Temperature by Using Nanoindentation[J]. Rare Metal Materials and Engineering,2017,46(5):1365~1369.]
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  • 收稿日期:2016-01-04
  • 最后修改日期:2016-03-22
  • 錄用日期:2016-03-30
  • 在線發(fā)布日期: 2017-09-27
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