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近年来正常生产的MB15镁合金二次挤压小型材,经常出现抗拉强度下降现象,大部分产品达不到强度指标,国外进口的同类合金BM65—1产品也有同样现象,严重的降低了产品的成品率和使用的可靠性。因此寻找性能下降的原因,研究提高强度的工艺方法,是当前急需解决的重要课题。为在生产条件下提高MB15合金的强度,我们对该合金的化学成分、熔铸工艺、均热制度和挤压工艺等进行了反复的试验和分析。研究认为,采用下述工艺措施可提高小型材强度:尽量提高锆含量(大于0.45％Zr);在熔炼时先加锌以便促进后加入的锆元素溶解于镁中;铸锭挤压前不均热处理;用铸锭一次挤压小型材。采用上述综合工艺,可使小型材强度提高19.6兆帕以上,从而提高了型材的成品率和可靠性。
In recent years, the normal production of MB15 magnesium alloy secondary extrusion of small sections, often appear to reduce the tensile strength phenomenon, most of the products fail to strength indicators, imported similar alloy BM65-1 products have the same phenomenon, seriously reducing the product Yield and reliability of use. Therefore, looking for reasons for the decline in performance, research methods to improve the intensity of the process is an urgent need to solve an important issue. In order to improve the strength of MB15 alloy under the production conditions, we conducted repeated tests and analyzes on the chemical composition, the casting process, the soaking system and the extrusion process of the alloy. The study suggests that the following measures can be used to improve the strength of small sections: as much as possible to increase the zirconium content (greater than 0.45% Zr); in the first melting of zinc added to promote the dissolution of zirconium dissolved in magnesium; ingot extrusion uneven Heat treatment; a small extrusion with ingots. Using the above comprehensive process, the strength of the small section can be increased by 19.6 MPa or more, thereby improving the yield and the reliability of the section.