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研究了不同取样方向对Ti65合金微观组织及电化学腐蚀行为的影响，分析了Ti65-90°和Ti65-45°取样方向试样的微观组织和耐蚀性能。结果表明：取样方向不影响αp相和αs相的比例，但会影响αp相平均面积、晶界密度和晶粒取向；Ti65-45°试样表现出更大的αp相平均面积、更低的晶界密度以及更高比例的耐腐蚀性[0001]取向晶粒；电化学测试结果表明Ti65-45°试样腐蚀电流密度为170.1 nA/cm2，仅为Ti65-90°试样(222.8 nA/cm2)的76%，但其钝化膜电阻更大，表面腐蚀产物更少；这主要是由于取样方向会对αp相面积、晶界密度和晶粒取向产生影响，进而影响钝化膜的致密性和完整性，从而改变合金的腐蚀行为。
Abstract：Effect of different sampling directions on the microstructure and electrochemical corrosion behavior of Ti65 alloy was studied. The microstructure and corrosion resistance of specimens prepared from Ti65-90° and Ti65-45° sampling orientations were analyzed. The results show that the sampling direction does not affect the volume fraction of the primary αp and secondary αs phases， but affects the average area of the αp phase， the grain boundary density and the crystallographic orientation. The Ti65-45° specimen shows a larger average αp phase area， a lower grain boundary density and a higher proportion of corrosion resistant [0001] oriented grains. The electrochemical test results show that the corrosion current density of the Ti65-45° specimen is 170.1 nA/cm2， which is only 76% of that of the Ti65-90° specimen (222.8 nA/cm)， but its passive film resistance is higher and the surface corrosion products are less. This is mainly because the sampling direction will affect the αp phase area， grain boundary density and grain orientation， which subsequently affects the compactness and integrity of the passive film， thus changing the corrosion behavior of the alloy.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2026-0047
中图分类号:TG146.23
引用信息:
[1]李玉华,赵蓉,张仟,等.取样方向对Ti65合金微观组织和电化学性能的影响[J].材料热处理学报().DOI:10.13289/j.issn.1009-6264.2026-0047.
基金信息:
国家自然科学基金(52404382); 陕西省重点研发计划项目(2023-YBGY-090)
2026-04-14
2026-04-14
2026-04-14