基于团簇加连接原子模型对TC21钛合金的成分优化
Composition optimization of TC21 titanium alloy based on cluster-plus-glue-atom model
查看参考文献35篇
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文摘
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运用源自最成熟Ti-6Al-4V合金的双团簇成分式,解析了高损伤容限的双相TC21(Ti-6Al-2Zr-2Sn-2Mo-2Nb- 1.5Cr)钛合金成分,指出其成分式由13个α-Ti和4个β-Ti结构单元构成。与Ti-6Al-4V相比,β-Ti结构单元从5减少到4,但是引入了更多的β稳定元素,使得该合金具有更好的强塑性。在此基础上,本工作将TC21的β-Ti团簇式内各β稳定元素原子等比例配比以增加混合熵,大量增加Zr含量以进一步提升β相稳定性,设计了团簇式为α-{[Al-Ti_(12)](AlTi_2)}_(13)+ β-{[(Al-(Ti_(12)Zr_2)]Sn_(0.75)Mo_(0.75)Nb_(0.75)Cr_(0.75)}_4(原子分数)的新合金TC21Z2,相应质量分数为Ti-5.9Al-5.4Zr-2.6Sn- 2.1Mo-2.0Nb-1.1Cr。采用真空铜模倾铸工艺进行样品制备,进而研究了合金的铸态组织和拉伸力学性能。研究发现, TC21Z2铸态组织为α+少量细针状α'马氏体+少量β相,其抗拉强度约为1289 MPa,屈服强度约为1181 MPa,伸长率约为1.4%,强度和塑性均高于同样状态下TC21合金。 |
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其他语种文摘
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The composition of high-damage-tolerance dual-phase TC21 (Ti-6Al-2Zr-2Sn-2Mo-2Nb- 1.5Cr) were analyzed on the basis of the dual-cluster formula of Ti-6Al-4V, consisting of 13 α-Ti and 4 β-Ti unit. Its β-Ti unit is reduced from 5 to 4 compared with Ti-6Al-4V, while adding more β-stabilizing elements to enhance the strength and plasticity. Subsequently, the atoms of each β-stabilizing element within the β-Ti cluster formula of TC21 were proportioned equally to increase the mixing entropy, and more Zr content was increased to substantially enhance the β-phase stability, giving the cluster formula as α -{[Al-Ti_(12)](AlTi_2)}_(13)+ β-{[(Al-(Ti_(12)Zr_2)]Sn_(0.75)Mo_(0.75)Nb_(0.75)Cr_(0.75)}_4(atom fraction), named as TC21Z2, with the corresponding mass fraction of Ti-5.9Al-5.4Zr-2.6Sn-2.1Mo-2.0Nb-1.1Cr. The samples were prepared by using vacuum copper mold pouring process and the as-cast microstructure and tensile mechanical properties of the alloy were studied. Results show that the as-cast microstructure of TC21Z2 is composed of α+ α' martensite+ a small amount of β phases, and its ultimate tensile strength, yield strength and elongation are 1289, 1181 MPa and 1.4%, respectively. Its strength and plasticity are better than those of the TC21 at the same state. |
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来源
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材料工程
,2024,52(5):117-126 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000510
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关键词
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钛合金
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团簇加连接原子模型
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成分式
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显微组织
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力学性能
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地址
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1.
大连理工大学材料科学与工程学院, 三束材料改性教育部重点实验室, 辽宁, 大连, 116024
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沈阳铸造研究所有限公司, 高端装备轻合金铸造技术国家重点实验室, 沈阳, 110022
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大连交通大学材料科学与工程学院, 辽宁, 大连, 116028
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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大连市科技创新基金重点学科重大课题
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国家重点基础研发项目
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文献收藏号
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CSCD:7723556
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