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等径角挤压是制备超细晶和纳米晶材料最有效的工艺之一。由于工业纯钛具有极佳的生物相容性,因此它可用作生物植入体材料。然而,较低的静/动态强度是纯钛类材料的不足之处。利用等径角挤压工艺可消除此类缺陷。本文作者在室温和通道角为135°条件下进行3道次挤压得到2级工业纯钛试样(2级CP-Ti)。对经等径角挤压3道次的CP-Ti样品进行显微组织分析及拉伸、硬度、三点弯曲和夏比冲击等力学性能测试。样品的显微组织演变结果表明,经等径角挤压工艺后样品的粗晶组织转变成超细晶或纳米晶组织。此外,力学性能测试结果表明,等径角挤压工艺能显著提高工业纯钛的屈服强度、抗拉强度、弯曲强度、硬度和断裂韧度,因此用该工艺制得的钛可以作为金属合金的替代品用作生物医用材料。
Isotopic angle extrusion is one of the most effective processes for the preparation of ultrafine and nanocrystalline materials. Because of the excellent biocompatibility of industrial grade titanium, it can be used as a bio-implant material. However, lower static / dynamic strength is a disadvantage of pure titanium materials. Equal-angle extrusion process can eliminate such defects. The author of the article at room temperature and channel angle of 135 ° under the conditions of 3 times the extrusion to obtain two industrial grade pure titanium samples (Grade CP-Ti). The CP-Ti samples extruded through 3 passes at equal path angle were tested for microstructure and mechanical properties such as tensile, hardness, three-point bending and Charpy impact. The results of microstructure evolution of the samples show that the coarse grains of the samples are transformed into ultrafine grains or nanocrystalline grains after the isobaric angle extrusion process. In addition, the mechanical properties of the test results show that the process of isobaric angle extrusion can significantly improve the yield strength of industrial pure titanium, tensile strength, flexural strength, hardness and fracture toughness, so the titanium produced by the process can be used as a metal alloy Alternatives for biomedical materials.