宋志儒,宋梦凡,王清,张爽,董闯

• 1:大连理工大学材料科学与工程学院
• 2:大连交通大学材料科学与工程学院

摘要(Abstract)：

应用团簇式方法，解析出一种典型高强韧亚稳β型TB18钛合金的团簇成分式，由5个α相和12个β相团簇式构成，α-{[Al-Ti_(12)](AlTi_2)}_5+β-{[Al-Ti_(14)](Mo_(5/8)V_(9/8)Cr_(9/8)Nb_(1/8))}_(12),相比于TC4显然该合金含有更多的β稳定元素，这是高强韧性的根源。为了进一步提升β相的稳定性，保持17个团簇总数不变，将β团簇式个数增加到14个，同时提高了β稳定元素含量，设计的团簇式为α-{[Al-Ti_(12)]AlTi_2}_3+β-{[Al-Ti_(14)] Mo_(5/8)V_(9/8)Cr_(9/8)Nb_(1/8)}_(14),成分为Ti-3.7Al-5.8Mo-5.5V-5.6Cr-1.1Nb。采用非自耗真空熔炼系统制备纽扣锭，随后热轧成板材，将试样在810℃固溶0.5 h后，分别在480、500和520℃时效8 h或24 h。结果表明：合金在480℃时效处理8 h并空冷后达到了强度与延展性的最佳平衡，抗拉强度为1380 MPa,屈服强度为1320 MPa,伸长率为5.5%,与相同热处理工艺下的TB18合金的性能相比，在伸长率保持同水平的基础上，抗拉强度和屈服强度分别提升了50和40 MPa。合金经固溶时效处理后，观察到尺寸为60～120 nm的次生α相析出，且随着时效温度的升高，次生α相发生粗化，强度降低。当时效时间从8 h增加到24 h,次生α相尺寸无明显变化，在520℃下时效24 h时，次生α相析出均匀。

关键词(KeyWords)： TB18钛合金;团簇式方法;热处理;力学性能;微观组织

Abstract:

Keywords:

基金项目(Foundation): 沈阳市自然科学基金(22-315-6-05);; 国家自然科学基金(52101127);; 辽宁省“兴辽英才计划”项目(XLYC2203121);; 大连市优秀青年科技人才项目(2023RY040)

作者(Author): 宋志儒,宋梦凡,王清,张爽,董闯

DOI: 10.13289/j.issn.1009-6264.2024-0217

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