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首页> 外文期刊>Materials Science and Engineering >High strength and high ductility in the Co-20Cr-15W-10Ni alloy having a bimodal grain structure achieved by static recrystallization
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High strength and high ductility in the Co-20Cr-15W-10Ni alloy having a bimodal grain structure achieved by static recrystallization

机译：通过静态重结晶获得具有双峰晶粒结构的Co-20Cr-15W-10Ni合金的高强度和高延展性

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摘要

A bimodal grain structure consisting of fine grains (d~ 1–2 µm) and coarse grains (d~ 10–20 µm) was achieved in the biomedical Co–20Cr–15W–10Ni alloy via medium cold rolling (area reduction of 50%) followed by short-term annealing (15 min) at relatively low temperatures (950–1100 °C). The medium cold rolling induced a heterogeneous microstructure featuring the coexistence of severely deformed regions and weakly deformed domains. With short-term annealing at low temperatures, fine and coarse grains were preferentially recrystallized in severely deformed regions and weakly deformed domains, respectively, resulting a bimodal grain size distribution. During tension, dislocations were more rapidly generated in the fine grains, thus increasing the strain hardening, while they glided longer on the {111} planes in the coarse grains, contributing a high ductility. The combination of these two factors provided well-balanced strength–ductility behavior with an ultimate tensile strength of 1278 MPa, a yield strength of 787 MPa, and an elongation to fracture of 53%, making the alloy suitable for surgical implant and stent applications where the strength and ductility are both important to ensure mechanical reliability in a human body.
机译：通过中冷轧制，在生物医学Co-20Cr-15W-10Ni合金中获得了由细晶粒（d〜1-2μm）和粗晶粒（d〜10-20μm）组成的双峰晶粒结构（面积减少50％） ），然后在较低的温度（950–1100 C）下进行短期退火（15 min）。中冷轧诱导出异质组织，其特征是严重变形区域和弱变形区域同时存在。通过在低温下进行短期退火，细晶粒和粗晶粒分别在严重变形的区域和弱变形的区域分别重结晶，从而产生双峰晶粒尺寸分布。在拉伸过程中，细晶粒中位错的产生更快，从而增加了应变硬化，而它们在粗晶粒的{111}面上滑行的时间更长，从而提高了延展性。这两个因素的结合提供了平衡良好的强度-延展性，极限抗拉强度为1278 MPa，屈服强度为787 MPa，断裂伸长率为53％，使该合金适用于外科植入物和支架应用。强度和延展性对于确保人体的机械可靠性都很重要。

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