微量硼对Ti-Fe-Cu-Sn-Nb合金力学性能的影响
Effect of minor boron on mechanical properties of Ti-Fe-Cu-Sn-Nb alloys
查看参考文献36篇
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文摘
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基于细晶强化和第二相强化原理,通过在一种近β钛合金中加入微量硼(B)元素,以强化该合金。首先设计不同含硼量的Ti_(85)Fe_6Cu_5Sn_2Nb_2合金,并用真空非自耗电弧炉制备,随后对合金在800℃下进行多道次热轧及最终淬火。通过组织观察、拉伸力学性能测试、断口观察及透射电子显微分析,考察不同硼含量对Ti_(85)Fe_6Cu_5Sn_2Nb_2合金组织及力学性能的影响。结果表明,微量硼元素可以使合金的晶粒细化,强度明显提高,但伴随着塑性下降。添加质量分数为0.15%硼可以使合金具有较好的综合力学性能(σ_(0.2)=1105MPa,δ_b=4.5%)。随着硼含量的增加,合金的强度升高,最高可达1156MPa。硼的加入在合金中形成正交结构的TiB相,分布于β钛基体中。变形过程中,TiB断裂、TiB割裂基体及其与基体脱粘,产生裂纹源,导致合金塑性下降。 |
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其他语种文摘
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Based on grain refinement and secondary phase strengthening,minor boron(B)was added to nearβ-Ti alloy to strengthen the alloys.Ti_(85)Fe_6Cu_5Sn_2Nb_2 alloys with various B contents were designed,prepared by using a non-consumable vacuum arc melting furnace,and hot rolled at 800℃ followed by quenching.The effects of minor B addition on the microstructure and mechanical properties of Ti_(85)Fe_6Cu_5Sn_2Nb_2alloy were investigated through microstructure observation,tensile mechanical test,fracture observation and transmit electron microscopy.The results reveal that minor B addition can refine the grains,improve the strength whereas the plasticity of the alloy is decreased. The alloy containing 0.15% (mass fraction)B possesses the better comprehensive mechanical properties (σ_(0.2)=1105MPa,δ_b=4.5%).With the increase of B content,the strength of the alloy is increased and reaches up to 1156MPa.Orthorhombic TiB compounds are formed in the alloy,distributed in the β-Tialloy matrix.Upon deformation,the fracture of TiB phases,cutting and debonding of TiB phases to the alloy matrix,formed the fracture source,resulted in the decrease of the alloy plasticity. |
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来源
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材料工程
,2021,49(11):156-162 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2019.001222
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关键词
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钛合金
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TiB
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力学性能
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显微组织
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地址
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1.
燕山大学, 亚稳材料制备技术与科学国家重点实验室, 河北, 秦皇岛, 066004
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济宁学院物理与信息工程系, 山东, 曲阜, 273155
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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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国家自然科学基金
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河北省研究生创新资助项目
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文献收藏号
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CSCD:7090769
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