原位合成不同基体组织7715D钛基复合材料的高温力学性能
High-Temperature Mechanical Properties of In-Situ Synthesized 7715D Titanium Matrix Composites with Different Matrix Microstructures
摘 要
利用真空电弧熔炼技术, 通过热加工原位合成了以TiB纤维和La2O3颗粒为增强体的7715D钛基复合材料, 然后分别在β相区与(α+β)相区退火, 获得层片和等轴两种基体组织;并对不同组织复合材料进行了高温拉伸试验、蠕变试验和不同温度下的热暴露试验。结果表明: 与等轴组织相比, 层片组织显著提高了复合材料的高温抗拉强度及蠕变性能, 能有效阻止增强体断裂后微裂纹的扩展;在600 ℃下热暴露时, 复合材料的热稳定性最差, 主要由在等轴组织初生α相中和层片组织的α片边界处析出颗粒状脆性相所致, 其对复合材料室温塑性均有不利影响。
高温力学性能
等轴组织
层片组织
titanium matrix composite
high-temperature mechanical property
equiaxed microstructure
lamellar microstructure
Abstract
7715D titanium matrix composites (TMC) reinforced with TiB fibres and La2O3 particles were in-situ synthesized through heat treatment by vacuum arc melting process. Lamellar and equiaxed microstructure could be obtained after annealed in β phase and (α+β) phase, respectively. High-temperature tensile test, creep test and heat exposure test at different temperatures were carried out for the composites with different microstructures. The results show that comparing with equiaxed microstructure, the lamellar microstructure obviously improved the high-temperature tensile strength and creep property of the composites, it could retard the micro-crack propagation after the reinforcement fracture effectively. After heat exposure at 600 ℃, the composites had the worst thermal stability, which due to the precipitation of granular brittle phases in the primary α phase of equiaxed microstructure and at the grain boundaries of lamellar microstructure. It was harmful to room temperature plasticity of the composites.
中图分类号 TG146.1
所属栏目
基金项目 国家“973”计划资助项目(2007CB613806);国家自然科学基金资助项目(50871066); 上海市科技启明星(跟踪)计划项目(09QH1401400)
收稿日期 2010/3/31
修改稿日期 2011/6/6
网络出版日期
作者单位点击查看
备注王沛培(1986-), 男, 安徽滁州人, 硕士研究生。
引用该论文: WANG Pei-pei,WANG Li-qiang,QIN Ji-ning,LV Wei-jie,ZHANG Di. High-Temperature Mechanical Properties of In-Situ Synthesized 7715D Titanium Matrix Composites with Different Matrix Microstructures[J]. Materials for mechancial engineering, 2011, 35(7): 22～26
王沛培,王立强,覃继宁,吕维洁,张荻. 原位合成不同基体组织7715D钛基复合材料的高温力学性能[J]. 机械工程材料, 2011, 35(7): 22～26
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参考文献
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【4】KIM Y J, CHUNG H, KANG S J. Processing and mechanical properties of Ti-6Al-4V/TiC in situ composite fabricated by gas-solid reaction[J].Materials Science and Engineering A, 2002, 333: 343-350.
【5】LU W J, ZHANG D, ZHANG X N, et al. Creep rupture life of in situ synthesized (TiB+TiC)/Ti matrix composites[J].Scripta Mater, 2001, 44: 2449-2455.
【6】GORSSE S, MIRACLE D B. Mechanical properties of Ti-6Al-4V/TiB composites with randomly oriented and aligned TiB reinforcements[J].Acta Mater, 2003, 51(9): 2427-2442.
【7】YANG Z F, LU W J, XU D, et al. In situ synthesis of hybrid and multiple-dimensioned titanium matrix composites[J].Journal of Alloys and Compounds, 2006, 419: 76-80.
【8】XIAO L, LU W J, QIN J N, et al. Steady state creep of in situ TiB plus La2O3 reinforced high temperature titanium matrix composite[J].Materials Science and Engineering A, 2009, 499: 500-506.
【9】耿珂, 吕维洁, 张荻, 等.原位合成TiB和Nd2O3增强钛基复合材料[J].上海交通大学学报, 2004, 38(2): 300-303.
【10】LUTJERING G. Influence of processing on microstructure and mechanical properties of (α+β) titanium alloys[J].Materials Science and Engineering A, 1998, 243: 32-45.
【11】WANG P, QIN J N, LU W J, et al. Creep behavior of in situ synthesized 7715D titanium matrix composite[J].Mater Trans, 2009, 50(6): 1411-1417.
【12】LI L, LU W J, QIN J N, et al. Superlastic deformation of in situ synthesized TiC/7715D matrix composite[J].Materials Science and Engineering A, 2009, 513/514: 384-388.
【13】XIAO L, LU W J, YANG Z F, et al. Effect of reinforcements on high temperature mechanical properties of in situ synthesized titanium matrix composites[J].Materials Science and Engineering A, 2008, 491: 192-198.
【14】XIAO L, LU W J, ZHANG D, et al. Thermal stability of in situ synthesized high temperature titanium matrix composites[J].Journal of Alloys and Compounds, 2009, 467: 135-141.
【15】ZHANG W G, SONG A J, LIU R P, et al. Microstructure and mechanical properties of TiCp/LD7 composite prepared by SHS/HE[J].Materials Science and Engineering A, 2008, 474: 225-229.
【16】WOODFIELD A P, POSTANS P J, LORETTO M H, et al. The effect of long-term high temperature exposure on the structure and properties of the titanium alloy Ti5331S[J].Acta Metall, 1988, 36(3): 507-515.
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