Ti750合金中初生α相的体积分数对固溶温度的敏感性

doi:10.11901/1005.3093.2019.164

材料研究学报

2019, Vol. 33

Issue (10): 794-800 DOI: 10.11901/1005.3093.2019.164

研究论文

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Ti750合金中初生α相的体积分数对固溶温度的敏感性

陈朝阳^1,²,陈志勇¹,朱绍祥¹,刘建荣¹(

),王清江¹

1. 中国科学院金属研究所沈阳 110016
2. 中国科学技术大学材料科学与工程学院沈阳 110016

Solution Temperature Sensitivity for Primary α-Phase Volume Fraction of Ti750 Alloys

CHEN Chaoyang^1,²,CHEN Zhiyong¹,ZHU Shaoxiang¹,LIU Jianrong¹(

),WANG Qingjiang¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

陈朝阳,陈志勇,朱绍祥,刘建荣,王清江. Ti750合金中初生α相的体积分数对固溶温度的敏感性[J]. 材料研究学报, 2019, 33(10): 794-800.
Chaoyang CHEN, Zhiyong CHEN, Shaoxiang ZHU, Jianrong LIU, Qingjiang WANG. Solution Temperature Sensitivity for Primary α-Phase Volume Fraction of Ti750 Alloys[J]. Chinese Journal of Materials Research, 2019, 33(10): 794-800.

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摘要:

研究了Ti750合金中初生α相的体积分数对固溶温度变化的敏感性。结果表明，在α+β两相区热处理的Ti750合金中初生α相的体积分数随着热处理温度的提高呈现先慢后快的下降趋势；合金中Mo元素的含量由0.25%(质量分数，下同)提高到1.0%使初生α相体积分数对固溶温度变化的敏感性降低。用电子探针分析了Al和Mo元素在初生α相中的分布，结果表明：在初生α相含量相同的合金中，Mo元素含量的提高使初生α相中的Al元素富集，使初生α相具有更高的热力学稳定性，从而降低了α_p相体积分数对固溶温度变化的敏感性，有利于准确控制热加工和热处理组织。

关键词 ：金属材料, 钛合金, 固溶温度, 电子探针, 初生α相, 敏感性

Abstract：

Solution temperature (T) sensitivity for the volume fraction (V) of primary α-phase in the α+β-phase field of two Ti750 alloys with 0.25 Mo and 1.0 Mo (mass fraction%) were comparatively investigated. The results show that the variation of volume fraction of primary α-phase with temperature seems to follow a negative power function curve, with a slow initial reduction and then rapid reduction with the increase of temperature for both alloys. The V-T curve for the alloy with 0.25% Mo showed a steeper slope compared with the alloy with 1.0% Mo, indicating that with the increase of Mo addition, the decrease of solution temperature sensitivity may emerge for the volume fraction of the primary α-phase in the α+β-phase field of Ti750 alloys. In the two alloys with the same volume fraction of primary α-phase, the Al concentration in the primary α-phase of the alloy with 1.0% Mo is higher than that of alloy with 0.25 % Mo. In other word, Mo indirectly increases the thermodynamic stability of the primary α-phase and thus reduces the temperature sensitivity of the volume fraction of α-phase in Ti750 alloy.

Key words： metallic materials titanium alloy solution temperature EPMA primary α-phase sensitivity

收稿日期: 2019-03-21

ZTFLH:

TG146.2

作者简介: 陈朝阳，男，1991年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.164 或 https://www.cjmr.org/CN/Y2019/V33/I10/794

图1 Ti750合金精锻棒材的显微组织

图2 在不同温度固溶热处理后Ti750合金的显微组织

图3 αp相体积分数随温度的变化

图4 αp相体积分数为60%时Al、Mo、W元素的面分布

表1 αp相中Al元素含量(质量分数)

图5 不同体积分数αp相中的Al元素含量

图6 钛合金的V-T曲线示意图

图7 在930℃热处理时αp相的体积分数随保温时间(τ)的变化

图8 钛合金Ti-Mo二元相图的示意图

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