1808年Widmanstatten在经过磨光和镂蚀的鐵镍陨石灰面观察到规则的图纹;这图纹的生成原因一直到1904年才由Osmond和Cartavd加以解释,它们认为这是新相沿着母相一定晶体平面析出的结果、此后在不同的合金中都发现了类似的组织,一般称为魏氏组织;这些组织都具有共同的特点,就是新相在母相的一定晶体平面析出(这平面称为惯析面),而在析出相与母机之间则具有一定的晶体取向关系,比如 In 1808, Widmanstatten observed regular patterns on polished and engraved iron-nickel meteorites; the pattern was not explained by Osmond and Cartavd until 1904, which they considered was the new facies along the parent phase A certain crystal plane precipitation results, thereafter found in different alloys are similar to the organization, commonly known as Wei’s organization; these organizations have the common feature is the new phase in the mother phase of a certain crystal plane precipitation (the plane said For the inertia surface), while in the precipitation phase and the mother machine has a certain crystal orientation relationship, such as