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Effect of Titanium Content on the Microstructure and Mechanical Properties of Tungsten-Titanium Alloy
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Effect of Titanium Content on the Microstructure and Mechanical Properties of Tungsten-Titanium Alloy
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National Natural Science Foundation of China (51101147)

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    摘要:

    采用粉末冶金方法制備了4種鈦含量分別為0.5%，1.0%，1.5%和2.0%的新型鎢鈦合金，分析了鈦含量對鎢鈦合金微觀組織以及高應變率加載條件下的動態(tài)力學性能的影響機理。結(jié)果表明，鈦顆粒以不同形貌分布于鎢合金的鎳鐵粘結(jié)相中，鈦顆粒直徑是影響鈦顆粒微觀形貌的主要因素。當鈦顆粒直徑大于20 μm時，鈦顆粒中存在大量微觀孔洞。鈦顆粒在粉末冶金液相燒結(jié)過程中沒有發(fā)生熔化以及溶解現(xiàn)象，但與鎢顆粒和粘結(jié)相的界面結(jié)合較好。霍普金森壓桿動態(tài)壓縮實驗結(jié)果表明，當動態(tài)加載應變率為3700 s-1時，鈦含量為0.5%的鎢鈦合金具有較高的動態(tài)壓縮屈服強度，而當鈦含量由1.0%增加到2.0%時，動態(tài)壓縮屈服強度減小趨勢減緩。鈦含量為2.0%的鎢鈦合金在高應變率加載條件下，在于軸向成45°方向上出現(xiàn)絕熱剪切帶。在絕熱剪切帶內(nèi)部，鈦顆粒發(fā)生伸長變形并且鈦顆粒中的微觀孔洞相互連接導致鈦顆粒碎化。由于鈦具有較低的導熱率，與鈦相連的鎢顆粒熱軟化區(qū)溫度身高幅度要高于常規(guī)鎢-鎳-鐵合金，熱軟化效應加劇導致鈦元素的加入以及含量的增加提高了鎢合金的絕熱剪切敏感性。

    Abstract:

    Tungsten heavy alloys (WHAs) with four different titanium contents (0.5%, 1.0%, 1.5%, 2.0%, wt.%) were prepared by powder metallurgy. The influence of titanium content on the microstructure and mechanical properties under high strain rates were investigated. The results show that the titanium particles disperse in the matrix with different morphology and the main effective element is the diameter of the titanium particles. There are lots of micro holes in the titanium particles when the diameter of titanium particles is larger than 20 μm. The titanium particles do not dissolve in the matrix during the sintering process and the interfaces between titanium and tungsten, titanium and matrix are good. The results of Hopkinson Striker Bar indicate that the dynamic compressive strength is highest when the content of titanium is 0.5% and the strength has little change as the content of titanium increases from 1.0% to 2.0% under 3700 s-1 strain rate. In the WHA with 2.0% titanium content, the adiabatic shear banding (ASB) is the main deformation mode and the titanium in the ASB is fragile, the temperature of thermal softening area is higher than that of the traditional WHAs because of the existence of titanium particles. The addition of titanium in the WHAs improves the adiabatic shear banding susceptivity.

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王 星,段東平,郭昀抒. Effect of Titanium Content on the Microstructure and Mechanical Properties of Tungsten-Titanium Alloy[J].稀有金屬材料與工程,2013,42(6):1108~1112.[Wang Xing, Duan Dongping, Guo Yunshu. Effect of Titanium Content on the Microstructure and Mechanical Properties of Tungsten-Titanium Alloy[J]. Rare Metal Materials and Engineering,2013,42(6):1108~1112.]
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  • 收稿日期:2012-06-25
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