金属学报  2011, Vol. 47 Issue (3): 317-320

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机械合金化热压烧结Mo-Si-B多相难熔合金的超塑性

喻吉良1,李中奎1,郑欣1,2,张建军1,2,刘辉1,2,王晖1,2,王文生1,2

1. 西北有色金属研究院 2.

SUPERPLASTICITY OF A MO-9SI-8B-3HF MULTIPHASE REFRACTORY ALLOY PREPARED BY MECHANICAL ALLOYING AND HOT PRESSING SINTERING

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喻吉良 李中奎 郑欣 张建军 刘辉 王晖 王文生. 机械合金化热压烧结Mo-Si-B多相难熔合金的超塑性[J]. 金属学报, 2011, 47(3): 317-320.
, , , , , , . SUPERPLASTICITY OF A MO-9SI-8B-3HF MULTIPHASE REFRACTORY ALLOY PREPARED BY MECHANICAL ALLOYING AND HOT PRESSING SINTERING[J]. Acta Metall Sin, 2011, 47(3): 317-320.

摘要 相关文章 Metrics 全文: PDF(767 KB)   摘要: 采用机械合金化(MA)+热压烧结制备Mo-9Si-8B-3Hf难熔合金，研究了球磨时间对热压合金致密度的影响。采用真空高温拉伸评价了该材料的高温性能。结果表明，材料的致密度随着球磨时间的延长而增大；X射线衍射(XRD)分析表明：制备的合金由连续分布的钼固溶体(α-Mo)相、金属间化合物Mo3Si相、Mo5SiB2相组成。各物相的平均晶粒尺寸大约为3μm，并且呈等轴状。在1400~1560℃、应变速率为3×10-4s-1条件下，该合金具有极大的塑性或超塑性。在1560℃由于行程限制尽管试样没有断裂，拉伸延伸率达到410%，表现出优异的超塑性。晶界滑移是塑性变形的主要机制。在塑性变形过程中连续分布的软化的α-Mo协调晶界滑移，减小了三角晶界处的应力集中，从而导致了大的延伸率。 关键词 ： Mo-Si-B合金,  金属间化合物,  机械合金化,  超塑性,  晶界滑移     Abstract：The demand for materials suitable for elevated temperature applications in the aircraft and aerospace industry beyond the realm of Ni-base superalloys has generated significant research interest in refractory metals and alloys, intermetallics and ceramics. The lack of damage tolerance in many intermetallics and most ceramics has guided research in the direction of multiphase refractory alloys which contained a matrix phase that is capable of providing damage tolerance, and a significant volume fraction of second phase that enhances the creep resistance of the alloy. Mutiphase Mo-Si-B alloys comprised of a α-Mo (Mo solid solution) and the intermetallic phases Mo3Si and Mo5SiB2 appear to offer favorable combinations of mechanical properties and oxidation resistance. It is widely accepted that the ideal microstructure of Mo-Si-B alloys would possess a continuous α-Mo matrix with embedded, homogeneously distributed intermetallic particles. For optimum toughening, microstructures containing a continuous matrix of the toughening phase are preferred over those in which the toughening phase occurs in the form of discrete particles. One purpose of this paper is to show that mechanical alloying (MA) in the solid state may be used to fabricate Mo-Si-B alloys with a continuous α-Mo matrix. One of the major drawbacks for hindering applications of Mo-Si-B alloys is poor formability even at elevated temperauture. Superplasticity which has the advantages of precision forming to the final net shape is a viable method to overcome this problem. The main purpose of this paper is to report the extensive plasticity or superplasticity of Mo-9Si-8B-3Hf alloy. A Mo-9Si-8B-3Hf multiphase refractory alloy was prepared by mechanical alloying (MA)and hot pressing sintering. Influence of milling time on density was studied. The tensile properties of this alloy at elevated temperature were evaluated by tensile tests in vacuum. Analysis of XRD reveals that this alloy consists of α-Mo (Mo solid solution), intermetallics Mo3Si and Mo5SiB2. The average grain sizes of each phase are all about 3μm and the grains shapes are nearly equiaxed. This alloy displayed extensive plasticity or superplasticity at temperatures ranging from 1400 ℃to 1560 ℃with strain rate of 3×10-4 s-1. Key words： Mo–Si–alloy    intermetallc    mechnical alloying    superplasticity    grain boundary sliding 收稿日期: 2010-09-27      ZTFLH:  TG146.4   基金资助:陕西省自然科学基金资助项目 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 喻吉良 李中奎 郑欣 张建军 刘辉 王晖 王文生 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2011/V47/I3/317 [1] 丁宗业, 胡侨丹, 卢温泉, 李建国. 基于同步辐射X射线成像液/固复层界面氢气泡的形核、生长演变与运动行为的原位研究[J]. 金属学报, 2022, 58(4): 567-580. [2] 周丽君, 位松, 郭敬东, 孙方远, 王新伟, 唐大伟. 基于飞秒激光时域热反射法的微尺度Cu-Sn金属间化合物热导率研究[J]. 金属学报, 2022, 58(12): 1645-1654. [3] 王慧远, 夏楠, 布如宇, 王珵, 查敏, 杨治政. 低合金化高性能变形镁合金研究现状及展望[J]. 金属学报, 2021, 57(11): 1429-1437. [4] 宫声凯, 尚勇, 张继, 郭喜平, 林均品, 赵希宏. 我国典型金属间化合物基高温结构材料的研究进展与应用[J]. 金属学报, 2019, 55(9): 1067-1076. [5] 吉华,邓运来,徐红勇,郭伟强,邓建峰,范世通. 焊接线能量对5182-O/HC260YD+Z异种材料CMT搭接接头组织与性能的影响[J]. 金属学报, 2019, 55(3): 376-388. [6] 陈丽群, 邱正琛, 于涛. Ru对NiAl[100](010)刃型位错电子结构的影响[J]. 金属学报, 2019, 55(2): 223-228. [7] 曹丽华, 陈胤伯, 史起源, 远杰, 刘志权. 合金元素对中温Sn-Ag-Cu焊料互连组织及剪切强度的影响[J]. 金属学报, 2019, 55(12): 1606-1614. [8] 何贤美, 童六牛, 高成, 王毅超. Nd含量对磁控溅射Si(111)/Cr/Nd-Co/Cr薄膜结构与磁性的影响[J]. 金属学报, 2019, 55(10): 1349-1358. [9] 张敏, 慕二龙, 王晓伟, 韩挺, 罗海龙. TA1/Cu/X65复合板焊接接头微观组织及力学性能[J]. 金属学报, 2018, 54(7): 1068-1076. [10] 康慧君, 李金玲, 王同敏, 郭景杰. 定向凝固Al-Mn-Be合金初生金属间化合物相生长行为及力学性能[J]. 金属学报, 2018, 54(5): 809-823. [11] 李斌, 林小辉, 李瑞, 张国君, 李来平, 张平祥. 不同B含量Mo-Si-B合金的高温抗氧化性能[J]. 金属学报, 2018, 54(12): 1792-1800. [12] 谢广明, 马宗义, 薛鹏, 骆宗安, 王国栋. 工具转速对搅拌摩擦加工Mg-Zn-Y-Zr耐热镁合金超塑性行为的影响[J]. 金属学报, 2018, 54(12): 1745-1755. [13] 王慧远, 张行, 徐新宇, 查敏, 王珵, 马品奎, 管志平. 超塑性轻合金组织稳定性的研究进展及展望[J]. 金属学报, 2018, 54(11): 1618-1624. [14] 耿林, 吴昊, 崔喜平, 范国华. 基于箔材反应退火合成的TiAl基复合材料板材研究进展[J]. 金属学报, 2018, 54(11): 1625-1636. [15] 于宣, 张志豪, 谢建新. 不同Ce含量Fe-6.5%Si合金的组织、有序结构和中温拉伸塑性[J]. 金属学报, 2017, 53(8): 927-936. Viewed Full text Abstract Cited   Shared      Discussed