-4增大到1.12′10-3；晶粒細(xì)化和微觀應(yīng)變?cè)龃笠鸬木Ц袢毕輹?huì)促進(jìn)晶粒內(nèi)部位錯(cuò)增殖、纏結(jié)來強(qiáng)化基體。"/>

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高壓扭轉(zhuǎn)對(duì)難熔金屬粉末組織致密及強(qiáng)化研究
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合肥工業(yè)大學(xué),合肥工業(yè)大學(xué),合肥工業(yè)大學(xué),合肥工業(yè)大學(xué),合肥工業(yè)大學(xué)

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教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃(2013JYXR0657)


Research of high-pressure torsion on dense compact and strengthening of refractory powder
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Hefei University of Technology,Hefei University of Technology,Hefei University of Technology,Hefei University of Technology,Hefei University of Technology

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    摘要:

    采用高壓扭轉(zhuǎn)法在350℃下將純鉬粉末直接制備成致密體材料。用金相顯微鏡、顯微維氏硬度計(jì)、掃描電鏡和X射線衍射儀分析高壓扭轉(zhuǎn)過程中粉末顆?？紫堕]合及性能強(qiáng)化規(guī)律。結(jié)果表明：高壓扭轉(zhuǎn)后鉬顆粒粉末在剪切力作用下通過移動(dòng)和變形相互嚙合聯(lián)結(jié),顆粒間大塊鏈狀孔隙逐漸縮小、閉合,此時(shí)顆粒間界面結(jié)合較好；高壓扭轉(zhuǎn)前后材料內(nèi)部亞晶尺寸由59.8nm細(xì)化到46.9nm,微觀應(yīng)變由1.04′10-4增大到1.12′10-3；晶粒細(xì)化和微觀應(yīng)變?cè)龃笠鸬木Ц袢毕輹?huì)促進(jìn)晶粒內(nèi)部位錯(cuò)增殖、纏結(jié)來強(qiáng)化基體。

    Abstract:

    Pure molybdenum powder was successfully directly compacted into the dense body material by high-pressure torsion at 350℃. The effects of HPT on pore closure and performance strengthening of the powder particle were investigated by optical telescope, microhardness-testing device, scanning electronic telescope and X-ray diffractometer. The results indicate that the molybdenum powder mechanical mesh each other by particles movement and deformation under shear force, at this time the interface bonding performance, the large chain pores in particles were welded effectively after high-pressure torsion. In the HPT process the crystal size decrease from 59.8nm to 46.9nm, the micro strain increases from 1.04′10-4to 1.12′10-3. The lattice defects caused by grain refinement and micro strain can promote dislocation multiplication and tangling to strengthen the matrixmethod.

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田 野,李 萍,馬俊林,薛克敏,林 泉.高壓扭轉(zhuǎn)對(duì)難熔金屬粉末組織致密及強(qiáng)化研究[J].稀有金屬材料與工程,2017,46(10):2987~2992.[Tian Ye, Li Ping, Ma Junlin, Xue Kemin, Lin Quan. Research of high-pressure torsion on dense compact and strengthening of refractory powder[J]. Rare Metal Materials and Engineering,2017,46(10):2987~2992.]
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  • 收稿日期:2015-06-25
  • 最后修改日期:2015-08-24
  • 錄用日期:2015-09-07
  • 在線發(fā)布日期: 2017-12-01
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