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| 1 | Design for Ti-Al-V-Mo-Nb alloys for laser additive manufacturing based on a cluster model and on their microstructure and properties显示文摘In this study,α+βTi-Al-V-Mo-Nb alloys with the addition of multiple elements that are suitable for laser additive manufacturing(LAM)were designed according to a Ti-6Al-4V cluster formula.This formula can be expressed as 12[Al-Ti12](AlTi2)+5[Al-Ti14]((Mo,V,Nb)2Ti),in which Mo and Nb were added into the alloys partially instead of V to give alloys with nominal compositions of Ti-6.01Al-3.13V-1.43Nb,Ti-5.97Al-2.33V-2.93Mo,and Ti-5.97Al-2.33V-2.20Mo-0.71Nb(wt.%).The microstructures and mechanical properties of the as-deposited and heat-treated samples prepared via LAM were examined.The sizes of theβcolumnar grains andαlaths in the Nb-containing samples are found to be larger than those of the Ti-6Al-4V alloy,whereas Mo-or Mo/Nb-added alloys contain finer grains.It indicates that Nb gives rise to coarsenedβcolumnar grains andαlaths,while Mo significantly refines them.Furthermore,the single addition of Nb improves the elongation,whereas the single addition of Mo enhances the strength of the alloys.The simultaneous addition of Mo/Nb significantly improves the comprehensive mechanical properties of the alloys,leading to the best properties with an ultimate tensile strength of 1,070 MPa,a yield strength of 1,004 MPa,an elongation of 9%,and micro-hardness of 355 HV.The fracture modes of all the alloys are ductile-brittle mixed fracture. | Tian-yu Liu Zhi-hao Zhu Shuang Zhang Xiao-hua Min Chuang Dong | 2021 | China Foundry2021，18，4： | 5 |
| 2 | 基于α''组织设计适于激光立体成形的新型高塑性Ti-4.13Al-9.36V合金显示文摘为了提高Ti-6Al-4V合金的加工硬化率和塑性,基于其团簇成分式12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(14)](V2Ti)设计成分式为4[Al-Ti_(12)](AlTi_(2))+12[Al-Ti_(14)](V2Ti)的(Ti-4.13Al-9.36V,%)合金,采用激光立体成形工艺制备Ti-4.13Al-9.36V和Ti-6.05Al-3.94V(对比合金),研究了沉积态和固溶温度对其显微组织和力学性能的影响。结果表明,沉积态Ti-4.13Al-9.36V和Ti-6.05Al-3.94V合金的显微组织均由基体外延生长的初生β柱状晶和晶内细小的网篮α板条组成。Ti-6.05Al-3.94V合金的初生β柱状晶的宽度约为770μm,α板条的宽度约为0.71μm;而Ti-4.13Al-9.36V合金的初生β柱状晶的宽度显著减小到606μm,α板条的宽度约为0.48μm。经920℃固溶-淬火处理后Ti-6.05Al-3.94V样品的显微组织为α’+α相,其室温拉伸屈服强度约为893 MPa,抗拉强度约为1071 MPa,延伸率约为3%。经750℃固溶-淬火处理后Ti-4.13Al-9.36V样品的显微组织为α’’+α相,与α’马氏体相比,应力诱发的α’’马氏体能显著地提高合金的加工硬化能力,其室温拉伸屈服强度约为383 MPa,抗拉强度约为989 MPa,延伸率达到了17%。这表明,根据团簇理论模型调控α’’+α的显微组织能有效提高激光立体成形Ti合金的加工硬化能力和塑性。 | 刘田雨 朱智浩 张爽 董闯 闵小华 王清 | 2021 | 材料研究学报2021，35，10： | 1 |
| 3 | 基于团簇式设计的高温高强钛合金组织性能研究显示文摘现用于激光熔化沉积的钛合金,通常是已有的工业合金,并没有考虑到激光熔化沉积工艺的特殊性。此外,高端装备领域对钛合金的室温和高温综合性能要求也不断提高。本文基于Ti-6Al-4V合金α相团簇式[Al-Ti_(12)](AlTi_(2))和β相团簇式[Al-Ti_(14)](AlVTi),通过Zr和V/Mo/Nb分别替代(相团簇式壳层和连接原子Ti的合金化,设计了一系列12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(14)-xZrx](AlV_(1.2)Mo)(0.6)Nb_(0.2))合金,并研究了激光熔化沉积Ti-Al-V-Mo-Nb-Zr系合金的微观组织和力学性能随Zr元素含量的演化规律。结果表明,Ti-Al-V-Mo-Nb-x Zr合金的液-固两相区较小,有利于保证激光熔化沉积的工艺性。此外,随Zr含量的增加,Ti-Al-V-Mo-Nb-x Zr合金外延生长β柱状晶的长度和宽度显著降低,室温和高温强度显著提高。其中,12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(12)Zr_(2)](AlV_(1.2)Mo)(0.6)Nb_(0.2))合金的室温抗拉强度为1427 MPa,伸长率为3.2%;600℃高温抗拉强度为642 MPa,伸长率为40%。该合金可以作为激光熔化沉积用高温高强钛合金的候选材料。 | 刘田雨 赵军 刘时兵 韩鹏江 史昆 姚谦 梅新民 陈红 | 2023 | 铸造2023，72，11： | 0 |
| 4 | 热处理过程TiAlCrMn高熵合金的高温氧化特性与力学性能显示文摘采用真空熔炼制备不同Al、Cr、Mn含量的TiAlCrMn系高熵合金,并对其高温氧化特性和热处理前后的力学性能进行研究。结果表明,随着Al、Cr、Mn含量的增加,其高温氧化质量增加率明显降低,这是因为在氧化层中形成了连续且致密的富(Al,Cr)氧化物,阻碍氧原子与其他合金原子相互扩散形成新的氧化物。另外,热处理前后的样品,其显微硬度均存在单调递增的趋势,晶粒粗化会导致样品硬度降低,而在高含量合金元素的样品中,析出强化会改善其硬度。变形诱导强化使材料获得更高的压缩强度,在500℃热处理后的样品其屈服强度有所降低,而经过900℃热处理的材料屈服强度得到提升,但其延展性降低。 | 陈平虎 李柏春 刘震 周英豪 李瑞卿 张昀 | 2024 | Transactions of Nonferrous Metals Society of China2024，34，1： | 0 |
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