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研究了热处理工艺对Ti-48Al-7Nb-2.5V-1.0Cr铸造合金组织、室温及900℃拉伸性能的影响。结果表明:铸造合金经1200℃/12 h/AC+1320℃/0.5 h/AC两步热处理后获得双态组织(DP);经1200℃/12 h/AC+1350℃/1 h/CC两步热处理后获得近片层组织(NL)。由拉伸实验结果可知,同合金铸态组织相比,DP和NL组织合金的室温塑性均得到明显的改善,断后伸长率由铸态的0.4%提高至双态组织的1.2%,近片层组织的1%~2%;但合金的室温及900℃的强度有不同程度的下降。
The effects of heat treatment on microstructure, room temperature and tensile properties of Ti-48Al-7Nb-2.5V-1.0Cr alloy were investigated. The results show that the binary microstructure (DP) is obtained after two steps of heat treatment at 1200 ℃ / 12 h / AC + 1320 ℃ / 0.5 h / AC. Near-lamellar tissue (NL) was obtained after the step heat treatment. Tensile test results show that, compared with the alloy as-cast microstructure, DP and NL microstructures at room temperature have been significantly improved plasticity, elongation at break from 0.4% as-cast to bimodal 1.2%, near-film Layer structure of 1% to 2%; but the alloy room temperature and 900 ° C strength have varying degrees of decline.