万海峰,许爱军,吴永刚,等.SPS烧结参数对Ti3Al2Mo5Nb室温及低温力学性能的影响[J].精密成形工程,2021,13(3):137-142.
WAN Hai-feng,XU Ai-jun,WU Yong-gang,et al.Effect of SPS Sintering Parameters on Mechanical Properties of Ti3Al2Mo5Nb Alloy at Room and Low Temperatures[J].Journal of Netshape Forming Engineering,2021,13(3):137-142. |
| SPS烧结参数对Ti3Al2Mo5Nb室温及低温力学性能的影响 |
| Effect of SPS Sintering Parameters on Mechanical Properties of Ti3Al2Mo5Nb Alloy at Room and Low Temperatures |
| 投稿时间：2021-03-21 |
| DOI：10.3969/j.issn.1674-6457.2021.03.017 |
| 中文关键词: 低温钛合金 SPS烧结 力学性能 低温性能 |
| 英文关键词: low temperature titanium alloy SPS sintering mechanical properties low temperature properties |
| 基金项目:装备预研领域基金(61409220123) |
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| 摘要点击次数: 2686 |
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| 中文摘要: |
| 目的 研究SPS烧结温度、保温时间等工艺参数对Ti3Al2Mo5Nb在不同温度下力学性能的影响规律。方法 利用放电等离子烧结(SPS)技术快速烧结，得到致密度较高的Ti3Al2Mo5Nb低温钛合金，通过设置不同的烧结温度及保温时间，结合室温及77 K低温力学性能测试，对不同参数得到的合金的室温及低温性能进行表征，探究SPS烧结过程中工艺参数对Ti3Al2Mo5Nb合金室温及低温力学性能的影响规律。结果 随着烧结温度的升高，合金的致密度、硬度逐渐提高，室温条件下的抗拉强度逐渐提高，伸长率逐渐降低，而77 K条件下合金的抗拉强度逐渐增加，伸长率先增加后减少。随着保温时间的增加，合金的致密度及硬度变化不大，无论在室温还是在77 K低温条件下，合金的强度均先减小后增加，伸长率逐渐减少。微观组织显示，随着烧结温度的增加，β相含量逐渐减少，与伸长率的变化相同，这可能是由于β相的存在促进了室温变形过程中晶界滑移及低温条件下产生孪晶;随着保温时间的增加，析出的强化相含量先减少后增加，这可能是导致合金强度变化的原因，同时β相含量减少，从而导致合金在273 K及77 K条件下的塑性均降低。结论 对低温条件下使用的钛合金而言，在50 MPa压力下，当温度为1050 ℃时，保温5 min得到的样品力学性能最好，过高的烧结温度及保温时间会减少合金中β相含量，降低低温塑性。 |
| 英文摘要: |
| The influence of SPS sintering temperature and holding time process parameters on the mechanical properties of Ti3Al2Mo5Nb at different temperatures was studied. Using spark plasma sintering (SPS) technology for rapid sintering, a high-density Ti3Al2Mo5Nb low-temperature titanium alloy is obtained. By setting different sintering temperatures and holding times, combined with room temperature and 77 K low-temperature mechanical performance tests, the alloys obtained with different parameters are The room temperature and low temperature properties were characterized, and the influence of process parameters on the mechanical properties of Ti3Al2Mo5Nb alloy at room temperature and low temperature during the SPS sintering process was explored. As the sintering temperature increases, the density and hardness of the alloy gradually increase, the tensile strength at room temperature gradually increases, and the elongation gradually decreases, while the tensile strength of the alloy gradually increases at 77 K, and the elongation first increases After reducing. As the holding time increases, the density and hardness of the alloy do not change much. The strength of the alloy first decreases and then increases, and the elongation decreases gradually, no matter at room temperature or at a low temperature of 77 K. The microstructure shows that as the sintering temperature increases, the content of β phase gradually decreases, which is the same as the change in elongation. This may be due to the existence of β phase that promotes grain boundary slip during room temperature deformation and the generation of twins under low temperature conditions; As the holding time increases, the content of the precipitated strengthening phase increases successively, which may be the reason for the change in the strength of the alloy, and at the same time the content of the β phase decreases, which leads to the decrease of the plasticity of the alloy under the conditions of 273 K and 77 K. For titanium alloys used under low temperature conditions, at a pressure of 50 MPa, when the temperature is 1050 ℃, the mechanical properties of the samples obtained by holding for 5 minutes are the best. Too high sintering temperature and holding time will reduce the content of β phase in the alloy, then reduce low temperature plasticity. |
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