Ozan Sertan, Lin Jixing, Weng Weijie, Zhang Yaowu, Li Yuncang, Wen Cuie
School of Engineering, RMIT University, Bundoora, Victoria, 3083, Australia.
Department of Mechanical Engineering, Yozgat Bozok University, 66100, Yozgat, Turkey.
Bioact Mater. 2019 Oct 25;4:303-311. doi: 10.1016/j.bioactmat.2019.10.007. eCollection 2019 Dec.
In this study, the microstructural evolution and mechanical properties of a newly developed Ti-40.7Zr-24.8Nb (TZN) alloy after different thermomechanical processes were examined. As-cast TZN alloy plates were solution-treated at 890 °C for 1 h, after which the thickness of the alloy plates was reduced by cold rolling at reduction ratios of 20%, 56%, 76%, and 86%. Stress-induced α" formation, {332} <113> β mechanical twinning, and kink band formation were observed in the cold-rolled TZN alloy samples. In the TZN sample after cold rolling at the 86% reduction ratio plus a recrystallization annealing at 890 °C for 1 h, the deformation products of a stress-induced α" phase, {332}<113> β mechanical twinning, and kink bands disappeared, resulting in a fine, equiaxed single β phase. The alloy samples exhibited elongation at rupture ranging from 7% to 20%, Young's modulus ranging from 63 to 72 GPa and tensile strength ranging from 753 to 1158 MPa. The TZN alloy sample after cold rolling and recrystallization annealing showed a yield strength of 803 MPa, a tensile strength of 848 MPa, an elongation at rupture of 20%, and an elastic admissible strain of 1.22%, along with the most ductile fractures during tensile testing.
在本研究中，对一种新开发的Ti-40.7Zr-24.8Nb（TZN）合金在不同热机械处理后的微观结构演变和力学性能进行了研究。铸态TZN合金板在890℃固溶处理1小时，之后通过冷轧将合金板厚度分别以20%、56%、76%和86%的压下率进行减薄。在冷轧后的TZN合金样品中观察到应力诱导α″相的形成、{332}<113>β机械孪晶和扭折带的形成。在86%压下率冷轧后再加上在890℃进行1小时再结晶退火的TZN样品中，应力诱导α″相、{332}<113>β机械孪晶和扭折带的变形产物消失，形成了细小的等轴单一β相。合金样品的断裂伸长率在7%至20%之间，杨氏模量在63至72GPa之间，抗拉强度在753至1158MPa之间。经过冷轧和再结晶退火的TZN合金样品在拉伸试验中表现出屈服强度为803MPa、抗拉强度为848MPa、断裂伸长率为20%、弹性许用应变率为1.22%，并且具有最具韧性的断裂。
