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20Zr-70Ti-6Al-4V合金靜動態(tài)力學性能研究
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北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室,北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室,北京理工大學材料學院 沖擊環(huán)境材料技術重點實驗室,燕山大學 亞穩(wěn)材料制備技術與科學國家重點實驗室

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TG146.414,TG113.25

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The static and dynamic mechanical properties of 20Zr-70Ti-6Al-4V alloy
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    摘要:

    本文以20Zr-70Ti-6Al-4V合金為研究對象,采用XRD、DSC、OM和SEM等測試分析技術,研究了合金在退火處理和固溶時效處理過程中的相變及組織演化規(guī)律,并通過萬能試驗機和分離式霍普金森壓桿,進一步研究了組織與應變速率對合金靜動態(tài)力學性能的影響。結果表明:20Zr-70Ti-6Al-4V合金經(jīng)退火和固溶時效后均由α相和β相組成,呈現(xiàn)為網(wǎng)籃組織,在靜態(tài)加載條件下,抗拉強度最高可達1301MPa,塑性應變最高可達14.9%,抗壓強度最高可達1386MPa,斷裂方式為韌性斷裂;在動態(tài)加載條件下,應變速率處于1000s-1到3000s-1這一高應變率范圍時,20Zr合金的動態(tài)抗壓強度有明顯提高,表現(xiàn)為應變率強化效應,在同一應變速率下,20Zr合金固溶時效態(tài)的抗壓強度和失效應變均高于退火態(tài);動態(tài)壓縮試樣表面觀測到與壓縮軸呈45°角的宏觀裂紋,動態(tài)破壞模式為絕熱剪切失穩(wěn)破壞。

    Abstract:

    This study aims to evaluate the static and dynamic mechanical properties of 20Zr-70Ti-6Al-4V alloy. The XRD, DSC, OM and SEM were used to test and analyze the phase transition and microstructural evolution of the 20Zr alloys subjected to different heat treatments. Dynamic compression tests were conducted by the SHPB(split Hopkinson pressure bar) to study the dynamic mechanical properties. The results showed that all 20Zr alloys were comprised of α and β phase and presented typical basketweave microstructures. At static conditions, the tensile strength was up to 1301 MPa., the plastic strain up to 14.9%, while the compressive strength was up to 1386 MPa. Under dynamic compression experiments, the dynamic compressive strength increased as the strain rate increased from 1000s-1 to 3000s-1, which reflected the strain hardening effect. In addition, the dynamic compressive strength and the plastic strain of 20Zr alloys undergoing the solid solution and aging treatment exceeded the anneal treated alloys. Besides, the failure of alloys resulted from the adiabatic shear bands.

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聶洋洋,程興旺,聶宇坤,劉日平.20Zr-70Ti-6Al-4V合金靜動態(tài)力學性能研究[J].稀有金屬材料與工程,2018,47(4):1210~1215.[Nie Yangyang, Cheng Xingwang, Nie Yukun, Liu Riping. The static and dynamic mechanical properties of 20Zr-70Ti-6Al-4V alloy[J]. Rare Metal Materials and Engineering,2018,47(4):1210~1215.]
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  • 收稿日期:2016-04-01
  • 最后修改日期:2016-07-18
  • 錄用日期:2016-08-17
  • 在線發(fā)布日期: 2018-05-31
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