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<p>Ti-<i>x</i>(0.7Fe–0.18Cr–0.12Ni) (<i>x</i> = 1, 2, 3, wt&#xa0;pct) alloys were fabricated by blending titanium powder with different amounts of 316L stainless steel (SS) powder followed by thermomechanical powder consolidation. An investigation was conducted into the impacts of the contents of Fe, Cr, and Ni on the microstructure, mechanical properties, and deformation behaviors of the titanium alloys. It was confirmed that as <i>β</i>-stabilizing elements, Fe, Cr, and Ni atoms are predominately partitioned in the <i>β</i> phase, so as the contents of Fe, Cr, and Ni increase, there is a resultant augmentation in the volume fraction of the <i>β</i> phase, accompanied by a reduction in the mean size of the <i>α</i> lamellae. The alloys exhibit a notable enhancement in yield strength, rising from 647 to 767&#xa0;MPa, as the (0.7Fe–0.18Cr–0.12Ni) content escalates from 1 to 3 wt&#xa0;pct. This enhancement is attributed to the enhanced solid solution strengthening of the <i>β</i> lamellae and the <i>α</i>/<i>β</i> interface strengthening. However, both the strain hardening rate and elongation to failure decrease significantly, leading to a much smaller magnitude of increase in ultimate tensile strength (797 to 851 MPa). The main reasons are the refinement of <i>α</i> lamellae weakens the dislocation accommodation capacity, the decrease of the fraction of hard zones, and the prevalence of the &lt;<Emphasis Type="BoldItalic">a</Emphasis>&gt; slips which cause shear banding and easy fracture.</p>

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Effects of Fe, Cr, and Ni Contents on the Microstructure and Mechanical Behaviors of Ti-x(0.7Fe–0.18Cr–0.12Ni) Alloys Fabricated by Thermomechanical Powder Consolidation

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Jiaqi Hu,
  • Lei Meng,
  • Cong Wang,
  • Hongchen Lai,
  • Yuanping Yu,
  • Deliang Zhang

摘要

Ti-x(0.7Fe–0.18Cr–0.12Ni) (x = 1, 2, 3, wt pct) alloys were fabricated by blending titanium powder with different amounts of 316L stainless steel (SS) powder followed by thermomechanical powder consolidation. An investigation was conducted into the impacts of the contents of Fe, Cr, and Ni on the microstructure, mechanical properties, and deformation behaviors of the titanium alloys. It was confirmed that as β-stabilizing elements, Fe, Cr, and Ni atoms are predominately partitioned in the β phase, so as the contents of Fe, Cr, and Ni increase, there is a resultant augmentation in the volume fraction of the β phase, accompanied by a reduction in the mean size of the α lamellae. The alloys exhibit a notable enhancement in yield strength, rising from 647 to 767 MPa, as the (0.7Fe–0.18Cr–0.12Ni) content escalates from 1 to 3 wt pct. This enhancement is attributed to the enhanced solid solution strengthening of the β lamellae and the α/β interface strengthening. However, both the strain hardening rate and elongation to failure decrease significantly, leading to a much smaller magnitude of increase in ultimate tensile strength (797 to 851 MPa). The main reasons are the refinement of α lamellae weakens the dislocation accommodation capacity, the decrease of the fraction of hard zones, and the prevalence of the <a> slips which cause shear banding and easy fracture.