| 不同SPS烧结温度Ti-45Al-5.5(Cr,Nb,B,Ta)合金的显微组织及力学性能(英文) |
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| 引用本文： | 肖树龙,徐丽娟,于宏宝,田竟,陈玉勇. 不同SPS烧结温度Ti-45Al-5.5(Cr,Nb,B,Ta)合金的显微组织及力学性能(英文)[J]. 中国有色金属学会会刊, 2012, 22(12): 2960-2964. DOI: 10.1016/S1003-6326(11)61556-2 |
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| 作者姓名： | 肖树龙 徐丽娟 于宏宝 田竟 陈玉勇 |
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| 作者单位： | 哈尔滨工业大学材料科学与工程学院;哈尔滨工业大学金属精密热加工国家级重点实验室;西北工业大学材料科学与工程学院 |
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| 基金项目： | Project (51001040) supported by the National Natural Science Foundation of China;Project (HITQNJS.2009.022) supported by Development Program for Outstanding Young Teachers in Harbin Institute of Technology;Project (2012RFQXG109) supported by the Youth Science and Technology Innovation Talents |
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| 摘 要： | 采用高能球磨和放电等离子烧结(SPS)技术,制备成分为Ti-45Al-5.5(Cr,Nb,B,Ta)的TiAl合金块体,随后对TiAl合金进行热处理。研究在不同SPS烧结温度下制备的TiAl合金经过热处理后的显微组织和力学性能。结果表明:高能球磨后的合金粉末形状不规则,粉末颗粒尺寸大约为几十微米。XRD分析表明,机械球磨后的粉末由TiAl和Ti3Al两相组成;烧结后的Ti-45Al-5.5(Cr,Nb,B,Ta)合金块体主要是TiAl相,以及少量的Ti3Al和TiB2相。当烧结温度为900°C和1000°C时,合金的显微组织为双相结构,并伴随有一些细小的等轴γ晶粒和细小的针状TiB2相。当烧结温度从900°C上升到1000°C时,Ti-45Al-5.5(Cr,Nb,B,Ta)合金的显微硬度变化不大,抗压强度从1812MPa提高到2275MPa,压缩率从22.66%增加到25.59%,合金的断裂方式为穿晶断裂。
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| 关 键 词： | TiAl合金 粉末冶金 放电等离子烧结 热处理 |
| 收稿时间： | 2012-07-09 |
Microstructure and mechanical properties of Ti-45Al-5.5(Cr,Nb,B,Ta) alloy sintered at different SPS temperatures |
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| XIAO Shu-long,XU Li-juan,YU Hong-bao,TIAN Jing,CHEN Yu-yong. Microstructure and mechanical properties of Ti-45Al-5.5(Cr,Nb,B,Ta) alloy sintered at different SPS temperatures[J]. Transactions of Nonferrous Metals Society of China, 2012, 22(12): 2960-2964. DOI: 10.1016/S1003-6326(11)61556-2 |
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| Authors: | XIAO Shu-long XU Li-juan YU Hong-bao TIAN Jing CHEN Yu-yong |
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| Affiliation: | 1,2 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China; 3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: | TiAl alloy bulk samples with the composition of Ti-45Al-5.5(Cr,Nb,B,Ta) (mole fraction, %) were prepared by high energy mechanical milling and spark plasma sintering (SPS) and then heat treatment. The microstructure and mechanical properties after heat treatment of TiAl alloy prepared by SPS at different temperatures were studied. The results showed that the morphology of high energy mechanically milled powder was irregular and the average grain size was about decades micrometers. X-ray diffraction analysis showed that the mechanically milled powder was composed of two phases of TiAl and Ti3Al. The main phase of TiAl and few phases of Ti3Al and TiB2 were observed in the SPS bulk samples of Ti-45Al-5.5(Cr,Nb,B,Ta) alloy. For samples sintered at 900 °C and 1000 °C, the microstructure was duplex structure with some fine equiaxed gamma grains and thin needly TiB2 phases. With the SPS temperature increasing from 900 °C to 1000 °C, the micro-hardness was changed little, the compression strength increased from 1812 MPa to 2275 MPa and the compression ratio increased from 22.66% to 25.59%. The fractography results showed that the compression fracture transform of the SPS Ti-45Al-5.5(Cr,Nb,B,Ta) alloy was rgranular rupture. |
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| Keywords: | TiAl alloy powder metallurgy spark plasma sintering (SPS) heat treatment |
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