以下为句子列表：
英文: Powder metal is often used instead because it is undesirable or impractical to join the elements through alloying or to produce parts by casting or other forming consists of producing small particles ,compacting ,and sintering .The squeezing pressure with
中文: 金属合金一般是无孔隙固体；因为炼制出的合金的实际效果不理想，或者通过铸造和其他成型方式对小的颗粒进行压制，烧结出来的产品零件无法满足需求，因而人们常常使用粉末金属来代替金属合金。
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