Achieving large near-linear elasticity, low modulus, and high strength in a metastable β-ti alloy by mild cold rolling
Achieving large near-linear elasticity, low modulus, and high strength in a metastable β-ti alloy by mild cold rolling
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DOI：
10.1016/j.jmst.2023.11.066
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发表时间：
2024-01
期刊：
影响因子：
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通讯作者：
Yu Fu;Wenlong Xiao;Jian Rong;Lei Ren;H. Peng;Yuhua Wen;Xinqing Zhao;Chaoli Ma
中科院分区：
文献类型：
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作者：
Yu Fu;Wenlong Xiao;Jian Rong;Lei Ren;H. Peng;Yuhua Wen;Xinqing Zhao;Chaoli Ma
在钛合金中同时实现高弹性、低模量和高强度一直是一个长期的挑战。在本研究中，进行冷轧以调节Ti-15 Nb-5 Zr-4 Sn-1 Fe合金的马氏体转变，以应对这一挑战。10%冷轧工艺主要是通过一种新的应力诱导β → α "→ α“马氏体顺序相变来适应的，伴随着ω相的消失，这足以诱导足够的马氏体和缺陷来抑制初始的快速应力诱导马氏体相变，而不破坏先前β晶粒的等轴形状。因此，新颖的顺序相变导致杨氏模量大幅降低50.5%，同时增加强度，从而得到2.34%的大的近线性弹性、45 GPa的低模量和1093 MPa的高强度的优异组合。得到的大的近线性弹性主要是由同时低模量和高强度服从胡克定律。这些研究结果提供了有价值的见解，实现同时高弹性和低模量的钛合金，通过调节应力诱导的顺序马氏体相变。
Simultaneously achieving high elasticity, low modulus, and high strength in Ti alloy has been a longstanding challenge. In this study, cold rolling was conducted to modulate the martensitic transformation of the Ti-15Nb-5Zr-4Sn-1Fe alloy to address this challenge. The 10% cold rolling process was primarily accommodated by a novel stress-induced sequential β-to-α′′-to-αʹ martensitic transformation accompanied by the disappearance of ω phase, which was sufficient to induce adequate martensite and defects to suppress the initial rapid stress-induced martensitic transformation, without destroying the equiaxed shape of prior β grains. Consequently, the novel sequential phase transformation led to a substantial decrease in Young's modulus by 50.5% while increasing the strength, resulting in an excellent combination of large near-linear elasticity of 2.34%, low modulus of 45 GPa, and high strength of 1093 MPa. The obtained large near-linear elasticity was mainly contributed by the concurrent low modulus and high strength obeying Hooke's law. These findings provide valuable insights into the attainment of concurrent high elasticity and low modulus in Ti alloys by regulating the stress-induced sequential martensitic transformation.