Biomedical Mg-Sn-Mn series magnesium alloy and plate rolling process thereof

Abstract

The invention provides a biomedical Mg-Sn-Mn series magnesium alloy and a plate rolling process thereof. The process is characterized in that: an Mg-Sn-Mn series magnesium alloy ingot comprising 1 to 3 percent of Sn, 0.15 to 1.0 percent of Mn, less than 0.002 percent of impurity element Fe or less than or equal to 0.02 percent of Fe / Mn, less than 0.002 percent of Cu, less than 0.002 percent of Ni and the balance of Mg is selected; a uniform thermal treatment process combining high-temperature short-time solid solution treatment and traditional solid solution treatment is adopted before rolling the ingot, wherein the temperature of the high-temperature short-time solid solution treatment is 550 to 560 DEG C and the treatment time is 1 to 2 hours, and the temperature of the traditional solid solution treatment is 300 to 450 DEG C and the time is 20 to 30 hours; and variable temperature large-deformation rolling is adopted during rolling. The Mg-Sn-Mn series magnesium alloy obtained by the rolling process has the advantages of no toxicity, full degradation and high toughness, and can be used as an orthopedic surgery internal fixation and implant material for intravascular stents, bone lamellas, bone nails and the like.

Description

Technical field [0001] The invention relates to an alloy, and the invention also relates to a method for preparing the alloy. In particular, it is an alloy used in the field of biomedical materials and a preparation method thereof. Background technique [0002] Currently, most biodegradable biomedical materials are polymer materials such as polylactic acid (PLA) and polyglycolic acid (PGA), but they have problems such as low mechanical properties, difficult processing, and degradation products in the body that easily cause inflammation and swelling. Degradable magnesium alloy has good comprehensive mechanical properties and machining properties. For example, extruded AZ31 magnesium alloy has high strength (tensile strength of 255MPa, yield strength up to 200MPa), which can meet the mechanical properties of biomedical materials. Claim. Moreover, the elastic modulus of magnesium alloy is about 40GPa, which is very close to bone tissue, which can effectively reduce the "stress shi...

AI Technical Summary

Problems solved by technology

Although rare earth elements such as neodymium and yttrium can improve the strength and corrosion resistance of magnesium alloys, their biological effects are still unclear, so their safety needs to be observed in long-term experiments

[0003] Aiming at the problem of poor room temperature plasticity of magnesium and magnesium alloys, people have developed ductile magnesium alloys, such as the technical solution disclosed in the invention patent document with the application number 200810234439.5 and the name "a ductile magnesium alloy and its preparation method"

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