| 引用本文: | 苏勇君,孔凡涛,张德良,陈玉勇.元素粉末锻造法制备Ti-43Al-5V-4Nb合金的组织与性能[J].材料科学与工艺,2013,21(4):84-88.DOI:10.11951/j.issn.1005-0299.20130415. |
| SU Yong-jun,KONG Fan-tao,ZHANG De-liang,CHEN Yu-yong.Microstructure and properties of Ti-43Al-5V-4Nb alloy fabricated byelemental powder metallurgy forging process[J].Materials Science and Technology,2013,21(4):84-88.DOI:10.11951/j.issn.1005-0299.20130415. |
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| 摘要: |
| 以Ti、Al等元素粉末为原料,采用快速烧结方法和无包套锻造法制备尺寸为Ф50×10 mm的TiAl合金锻坯.快速烧结后,TiAl合金由TiAl、Ti3Al、B2、Ti和TiAl3相组成,并且该合金存在较多的孔隙,孔隙主要由偏扩散造成的；经过高温锻造后,其孔隙得到了有效的控制,相对密度达到93%；经过热处理后,该合金主要由TiAl和Ti3Al相组成,在室温下合金的屈服强度提高了110 MPa,达到480 MPa,室温延伸率到达0.83%；在700 ℃和750 ℃,其屈服强度分别为580 MPa和530 MPa,其延伸率分别为12%和27%. |
| 关键词: TiAl合金 元素粉末 锻造 组织 性能 |
| DOI：10.11951/j.issn.1005-0299.20130415 |
| 分类号: |
| 基金项目:国家自然科学基金资助(51074058). |
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| Microstructure and properties of Ti-43Al-5V-4Nb alloy fabricated byelemental powder metallurgy forging process |
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SU Yong-jun1,KONG Fan-tao1,ZHANG De-liang2,CHEN Yu-yong1
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(1.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China; 2.School of Science and Engineering,University of Waikato,Hamilton 3105,New Zealand)
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| Abstract: |
| TiAl based alloy was fabricated by rapid sintering and open-die forging using elemental metallurgy. The result show that, after rapid sintering, the alloy with many pores is composed of TiAl, Ti3Al, B2, Ti and TiAl3 phases, and the reason of the exiting pores is Al self-diffusion in the process of sintering. The relative density could be increased effectively by forging to 93%. After heat treatment, the alloy composed of TiAl and Ti3Al phases has excellent properties, the yield strength at room temperature increases by about 110MPa and reaches 480MPa, and the ductility increases to 0.83%. At 700℃ and 750℃, the yield strengths are 580MPa and 530MPa, and the ductilities are 12% and 27%, respectively. |
| Key words: TiAl based alloy elemental powder forging microstructure properties |
